7×57mm Mauser
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The 7×57mm Mauser (designated as the 7 mm Mauser or 7×57mm by the
SAAMI The Sporting Arms and Ammunition Manufacturers' Institute (SAAMI, pronounced "Sammy") is an association of American manufacturers of firearms, ammunition, and components. SAAMI is an accredited standards developer that publishes several Americ ...
and 7 × 57 by the C.I.P.) is a first-generation
smokeless powder Finnish smokeless powderSmokeless powder is a type of propellant used in firearms and artillery that produces less smoke and less fouling when fired compared to gunpowder ("black powder"). The combustion products are mainly gaseous, compared to a ...
rimless A rim is an external flange that is machined, cast, molded, stamped, or pressed around the bottom of a firearms cartridge. Thus, rimmed cartridges are sometimes called "flanged" cartridges. Almost all cartridges feature an extractor or headspacing ...
bottlenecked
rifle A rifle is a long-barreled firearm designed for accurate shooting, with a barrel that has a helical pattern of grooves ( rifling) cut into the bore wall. In keeping with their focus on accuracy, rifles are typically designed to be held with ...
cartridge Cartridge may refer to: Objects * Cartridge (firearms), a type of modern ammunition * ROM cartridge, a removable component in an electronic device * Cartridge (respirator), a type of filter used in respirators Other uses * Cartridge (surname), a ...
. It was developed by Paul Mauser of the Mauser company in 1892 and adopted as a military cartridge by Spain in 1893.Jim Wilson "A Perfectly Delightful Cartridge: 7×57 mm Mauser" ''American Rifleman'' November 2009 pp.53–55 It was subsequently adopted by several other countries as the standard military cartridge, and although now obsolete as a military cartridge, it remains in widespread international use as a sporting round. The 7×57 Mauser (originally known in Britain as the .275) was a popular stalking cartridge and sporting rifles in this chambering were made by the famous British riflemakers, such as John Rigby, Holland and Holland, Westley Richards and others. British cartridge nomenclature designated caliber in inches, and the cartridge was known as the .275 bore after the measurement of a 7 mm rifle's bore across the
lands Land is the solid surface of the Earth that is not covered by water. Land, lands, The Land, or the Lands may also refer to: Entertainment and media Film * ''Land'' (1987 film), a British television film by Barry Collins * ''Land'' (2018 film), ...
.


History

Paul Mauser visited the
Kingdom of Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , i ...
in 1892 after the delivery of trial rifles in 1891 and brought with him a new rifle designed to use a new cartridge of 7 mm caliber. Judging by the dimensions of the casing, it was developed from Mauser's
Patrone 88 The ''Patrone 88'' (cartridge 88) or M/88 is a rimless bottlenecked rifle cartridge. It was a first-generation smokeless propellant cartridge designed by the German ''Gewehr-Prüfungskommission'' (G.P.K.) (Rifle Testing Commission) as the then n ...
adopted into German service: in fact, its derivative,
6.5×57mm Mauser The 6.5×57mm Mauser (designated as the 6,5 × 57 by the C.I.P.) is a smokeless powder rimless bottlenecked centerfire rifle cartridge developed by Paul Mauser and introduced in 1893–94. Overview The 6.5×57mm Mauser was designed and intro ...
, was marketed as ''M88/57/6.5 mit und ohne Rand'' in a 1921 catalog. Like the
7.65×53mm Mauser The 7.65×53mm Mauser (designated as the 7,65 × 53 Arg. by the C.I.P.) is a first-generation smokeless powder Rim (firearms), rimless bottlenecked rifle Cartridge (firearms), cartridge developed for use in the Mauser Model 1889 rifle by Paul Maus ...
introduced in 1889, he had developed the 7×57mm Mauser cartridge for use with the new
smokeless propellant Finnish smokeless powderSmokeless powder is a type of propellant used in firearms and artillery that produces less smoke and less fouling when fired compared to gunpowder ("black powder"). The combustion products are mainly gaseous, compared to ...
, introduced as
Poudre B Poudre B was the first practical smokeless gunpowder created in 1884. It was perfected between 1882 and 1884 at "Laboratoire Central des Poudres et Salpêtres" in Paris, France. Originally called "Poudre V" from the name of the inventor, Paul Vi ...
in the 1886 pattern
8mm Lebel 8 mm or 8mm may refer to: ;Film technology * 8 mm film, a photographic cine film format principally intended for domestic use. The term may also refer to later variants: ** Super 8 mm film ** Single-8 film ** 8 mm video format, a type of video reco ...
, which started a military rifle ammunition revolution. At the time of its development 7×57mm Mauser was a high-performance smokeless-powder cartridge. The Mauser Model 1892 rifle turned out to be a transitional design that was manufactured in limited numbers for the Spanish Army. It was quickly improved to the
Mauser Model 1893 The Mauser Model 1893 is a bolt-action rifle commonly referred to as the Spanish Mauser, though the model was adopted by other countries in other calibers, most notably the Ottoman Empire. The M1893 was based on the experimental M1892 rifle, whic ...
featuring a new internal
box magazine A magazine is an ammunition storage and feeding device for a repeating firearm, either integral within the gun (internal/fixed magazine) or externally attached (detachable magazine). The magazine functions by holding several cartridges withi ...
where the cartridges were stored in a staggered column. The Spaniards were so impressed with the Mauser Model 1892 and 1893 rifles and their new 7×57mm Mauser cartridge that they not only ordered rifles and ammunition with Mauser, but also awarded him the Grand Cross of the Spanish Military Order of Merit, the highest decoration Mauser ever received.


Cartridge dimensions

The 7×57mm cartridge has 3.90 ml (60
grains A grain is a small, hard, dry fruit (caryopsis) – with or without an attached hull layer – harvested for human or animal consumption. A grain crop is a grain-producing plant. The two main types of commercial grain crops are cereals and legumes ...
H2O) cartridge case capacity. The exterior shape of the case was designed to promote reliable case feeding and extraction in
bolt-action Bolt-action is a type of manual firearm action that is operated by ''directly'' manipulating the bolt via a bolt handle, which is most commonly placed on the right-hand side of the weapon (as most users are right-handed). Most bolt-action ...
rifles and
machine guns A machine gun is a fully automatic, rifled autoloading firearm designed for sustained direct fire with rifle cartridges. Other automatic firearms such as automatic shotguns and automatic rifles (including assault rifles and battle rifles) a ...
alike, under extreme conditions. 7×57mm maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm). Americans would define the shoulder angle at alpha/2 ≈ 20.55 degrees. The common
rifling In firearms, rifling is machining helical grooves into the internal (bore) surface of a gun's barrel for the purpose of exerting torque and thus imparting a spin to a projectile around its longitudinal axis during shooting to stabilize the pro ...
twist rate In firearms, rifling is machining helical grooves into the internal (bore) surface of a gun's barrel for the purpose of exerting torque and thus imparting a spin to a projectile around its longitudinal axis during shooting to stabilize the pro ...
for this cartridge is 220 mm (1 in 8.66 in), 4 grooves, diameter of lands = , diameter of grooves = , land width = and the primer type is large rifle. European 7 mm cartridges all have 7.24 mm (0.285 in) grooves diameter. American 7 mm cartridges have 7.21 mm (0.284 in) grooves diameter. According to the official C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the 7×57mm case can handle up to Pmax piezo pressure. In C.I.P. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. pressure to certify for sale to consumers. The
SAAMI The Sporting Arms and Ammunition Manufacturers' Institute (SAAMI, pronounced "Sammy") is an association of American manufacturers of firearms, ammunition, and components. SAAMI is an accredited standards developer that publishes several Americ ...
maximum average pressure (MAP) for this cartridge is piezo pressure or 46,000
CUP A cup is an open-top used to hold hot or cold liquids for pouring or drinking; while mainly used for drinking, it also can be used to store solids for pouring (e.g., sugar, flour, grains, salt). Cups may be made of glass, metal, china, clay, ...
. This lower specification is in deference to the Remington Rolling block rifles that may still be in circulation. Concerns regarding the early Mauser rifles such as the models 93 and 95 are misplaced, as the original ammunition issued with the M93 Spanish Mauser produced an average pressure of 50,370 CUP in those rifles.


7×57mmR (rimmed)

A rimmed cartridge was developed from the 7×57mm shortly after its introduction for use in break-action rifles and combination guns. A rimmed cartridge greatly simplifies the issues of designing an extractor, particularly in a combination gun or "drilling" which must also be designed to extract rimmed shotgun shells. While various modern break-action and single-shot rifle and pistol designs have been developed that can reliably extract rimless cartridges, most of these date from the 1970s or later. While the external dimensions of the two versions are nearly identical other than the rim, there are differences in the internal design. In particular, the cartridge web, the area immediately above the rim on the rimmed version or the rebate on the rimless version, is thinner in the rimmed case, and some authorities recommend limiting the rimmed cartridge to 41,000 CUP because of this. 7×57mmR cartridge dimensions. All sizes in millimeters (mm).


Sporting round

The ballistics of the 7×57mm became popular with deer and plains game hunters. The relatively flat trajectory and manageable recoil ensured its place as a sportsman's cartridge. The 7×57mm can offer very good penetrating ability due to a fast twist rate that enables it to fire long, heavy bullets with a high
sectional density Sectional density (often abbreviated SD) is the ratio of an object's mass to its cross sectional area with respect to a given axis. It conveys how well an object's mass is distributed (by its shape) to overcome resistance along that axis. Secti ...
. This made it popular in Africa, where it was used on animals up to and including elephants, for which it was particularly favoured by noted ivory hunter W.D.M. "Karamojo" Bell, who shot about 800 African elephants with 1893 pattern 7×57mm military ball ammunition using Rigby
Mauser 98 The Gewehr 98 (abbreviated G98, Gew 98, or M98) is a German bolt-action rifle made by Mauser, firing cartridges from a five-round internal clip-loaded magazine. It was the German service rifle from 1898 to 1935, when it was replaced by the K ...
rifles, when most ivory hunters were using larger-caliber rifles. Bell selected the cartridge for moderate recoil, and relied on the long round-nosed military full metal jacket bullets for penetration. The 7×57mm was also the favored cartridge of Eleanor O'Connor, wife of famous hunter and author Jack O'Connor. Eleanor accompanied her husband on multiple hunting expeditions all over the world, killing small and large game with the 7×57mm. Jack O'Connor also made extensive use of the round and remarked that "I think I have seen more game killed with fewer shots from this modest little cartridge than with any other." Though not as popular today, the 7×57mm is still produced by most major ammunition manufacturers and many modern rifles are available chambered for the cartridge. The cartridge is more popular in Europe than in the United States and most European gunmakers chamber rifles in 7×57mm. (Although they may not export them to the USA.) The 7×57mm round was also used by the Indian hunter and conservationist
Jim Corbett Edward James Corbett (25 July 1875 – 19 April 1955) was a British hunter, tracker, naturalist, and author who hunted a number of man-eating tigers and leopards in the Indian subcontinent. He held the rank of colonel in the British Indian ...
to put down the infamous man-eating
Leopard of Rudraprayag The Leopard of Rudraprayag was a male man-eating leopard, reputed to have killed over 125 people. It was eventually killed by hunter and author Jim Corbett. Attacks The first victim of the leopard was from Benji Village, and was killed in ...
besides a few other
Man-Eaters of Kumaon ''Man-Eaters of Kumaon'' is a 1944 book written by hunter-naturalist Jim Corbett. It details the experiences that Corbett had in the Kumaon region of India from the 1900s to the 1930s, while hunting man-eating Bengal tigers and Indian leopards. ...
. Corbett's writings mention using the .275 Mauser-Rigby rifle with attached torch to despatch the leopard on a dark summer night in May 1926. For man-eating tigers, Corbett preferred the .450/400 Nitro Express cartridge in a double-barrelled configuration from W.J. Jeffery & Co as the
.400 Jeffery Nitro Express The .400 Jeffery Nitro Express or .450/400 Nitro Express 3-inch is a medium bore, bottlenecked, Nitro Express cartridge designed by W.J. Jeffery & Co in 1902, intended for use in single shot and double rifles. Development The W.J. Jeffery & Co ...
rifle but retained the Mauser-Rigby as a backup weapon. The 7×57 is able to handle a wide range of projectile weights, is easy to reload, has relatively mild recoil, and is accurate. Some rifle
metallic silhouette Metallic silhouette shooting is a group of target shooting disciplines that involves shooting at steel targets representing game animals at varying distances, seeking to knock the metal target over. Metallic silhouette is shot with large bore ri ...
shooters use 7×57.


Military use

The military of the
Kingdom of Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , i ...
adopted the
Mauser Model 1893 The Mauser Model 1893 is a bolt-action rifle commonly referred to as the Spanish Mauser, though the model was adopted by other countries in other calibers, most notably the Ottoman Empire. The M1893 was based on the experimental M1892 rifle, whic ...
rifle. It was chambered for the new 7×57mm Mauser cartridge. The original cartridge featured a long, round-nose, full-metal-jacketed bullet with a muzzle velocity of about with muzzle energy from a barreled rifle. For the late 19th century, these ballistics were impressive, and the loading provided a fairly flat trajectory combined with excellent penetration. At the same time, it exhibited relatively modest
free recoil Free recoil is a vernacular term or jargon for recoil energy of a firearm not supported from behind. Free recoil denotes the translational kinetic energy (''Et'') imparted to the shooter of a small arm when discharged and is expressed in joules ( ...
. That was a combination of attributes that made it popular with both soldiers and sportsmen alike. The qualities of the 7×57mm as a military round were shown in the
Spanish–American War , partof = the Philippine Revolution, the decolonization of the Americas, and the Cuban War of Independence , image = Collage infobox for Spanish-American War.jpg , image_size = 300px , caption = (clock ...
of 1898. At the commencement of the American assault on the strategic Cuban city of
Santiago Santiago (, ; ), also known as Santiago de Chile, is the capital and largest city of Chile as well as one of the largest cities in the Americas. It is the center of Chile's most densely populated region, the Santiago Metropolitan Region, whose ...
, 750 Spanish troops defended positions on San Juan and Kettle hills. The attacking force numbered approximately 6,600 American soldiers, most of them armed with new smokeless-powder
Krag–Jørgensen The Krag–Jørgensen is a repeating bolt-action rifle designed by the Norwegians Ole Herman Johannes Krag and Erik Jørgensen in the late 19th century. It was adopted as a standard arm by Norway, Denmark, and the United States. About 300 wer ...
rifles in
.30-40 Krag The .30-40 Krag (also known as .30 U.S. and .30 Army) was a cartridge developed in the early 1890s to provide the U.S. armed forces with a smokeless powder cartridge suited for use with modern small-bore repeating rifles to be selected in the 1 ...
caliber, and supported by artillery and
Gatling gun The Gatling gun is a rapid-firing multiple-barrel firearm invented in 1861 by Richard Jordan Gatling. It is an early machine gun and a forerunner of the modern electric motor-driven rotary cannon. The Gatling gun's operation centered on a cyc ...
fire. Though the assault was successful, the Americans suffered more than 1,400 casualties, nearly 20 per cent of their forces. A U.S. board of investigation later concluded that the casualties were primarily due to the superior firepower of the Spanish Model 1893 Mauser rifles. During the
Second Boer War The Second Boer War ( af, Tweede Vryheidsoorlog, , 11 October 189931 May 1902), also known as the Boer War, the Anglo–Boer War, or the South African War, was a conflict fought between the British Empire and the two Boer Republics (the Sout ...
in South Africa, British authorities were obliged to re-evaluate rifle and ammunition design and tactics after facing Boer
sharpshooter A sharpshooter is one who is highly proficient at firing firearms or other projectile weapons accurately. Military units composed of sharpshooters were important factors in 19th-century combat. Along with "marksman" and "expert", "sharpshooter" i ...
s and
sniper A sniper is a military/paramilitary marksman who engages targets from positions of concealment or at distances exceeding the target's detection capabilities. Snipers generally have specialized training and are equipped with high-precision r ...
s armed with Mauser Model 1893 rifles and
Mauser Model 1895 The Mauser Model 1895 is a bolt operated magazine fed rifle using the 7×57mm Mauser cartridge. It was exported to many overseas powers, including the Chilean forces which adopted as the Fusil Mauser Chileno Mo 1895. It is the first major modific ...
rifles firing 7×57mm rounds with withering effectiveness, easily outranging the
.303 British The .303 British (designated as the 303 British by the C.I.P. and SAAMI) or 7.7×56mmR, is a calibre rimmed rifle cartridge. The .303 inch bore diameter is measured between rifling lands as is the common practice in Europe which follows th ...
cartridge as regards accurate long-range fire. The .303 British cartridge at that time was still using
cordite Cordite is a family of smokeless propellants developed and produced in the United Kingdom since 1889 to replace black powder as a military propellant. Like modern gunpowder, cordite is classified as a low explosive because of its slow burn ...
propellant, in contrast to the Mauser's higher-performance
ballistite Ballistite is a smokeless propellant made from two high explosives, nitrocellulose and nitroglycerine. It was developed and patented by Alfred Nobel in the late 19th century. Military adoption Alfred Nobel patented https://www.nobelprize.org/alf ...
type
smokeless powder Finnish smokeless powderSmokeless powder is a type of propellant used in firearms and artillery that produces less smoke and less fouling when fired compared to gunpowder ("black powder"). The combustion products are mainly gaseous, compared to a ...
.


Military ammunition

The oldest 1893 pattern military ball ammunition was loaded with a long round-nosed
bullet A bullet is a kinetic projectile, a component of firearm ammunition that is shot from a gun barrel. Bullets are made of a variety of materials, such as copper, lead, steel, polymer, rubber and even wax. Bullets are made in various shapes and co ...
fired at a muzzle velocity of with muzzle energy from a long barrel. It had a maximum range of .FN Mauser Model 98 Rifle and Carbine Operator's Manual page 28
In 1893 this ballistic performance made it the high-performance service cartridge champion of its day when compared to other 1893 pattern smokeless-powder cartridges such as the
8mm Lebel 8 mm or 8mm may refer to: ;Film technology * 8 mm film, a photographic cine film format principally intended for domestic use. The term may also refer to later variants: ** Super 8 mm film ** Single-8 film ** 8 mm video format, a type of video reco ...
,
.303 British The .303 British (designated as the 303 British by the C.I.P. and SAAMI) or 7.7×56mmR, is a calibre rimmed rifle cartridge. The .303 inch bore diameter is measured between rifling lands as is the common practice in Europe which follows th ...
, and
8×50mmR Mannlicher The Austro-Hungarian 8×50mmR Mannlicher or 8×50mmR M93 is a service cartridge dating back to the days of semi-smokeless powder. It was later replaced by (and many weapons were rechambered for) the 8×56mmR cartridge. History M90 In appr ...
. In 1913, following the lead of French and German Army commands in developing the ''spitzer'' or pointed-tip bullet shape, the Spanish ordnance authorities issued a redesigned 7×57mm cartridge with a
spitzer bullet The spitzer bullet (or spire point) is a pointed projectile that is primarily used in small-arms. The pointed nose shape, which was developed for military purposes in the late 19th and early 20th century, was a major design improvement compared ...
(''7 mm Cartucho para Mauser Tipo S''). It was loaded with a spitzer bullet fired at a muzzle velocity of with muzzle energy from a long barrel. It had a maximum range of . The new spitzer bullet style was partially responsible for the cartridge's improved performance as it significantly reduced
air drag In fluid dynamics, drag (sometimes called air resistance, a type of friction, or fluid resistance, another type of friction or fluid friction) is a force acting opposite to the relative motion of any object moving with respect to a surrounding ...
within normal combat ranges and withstood higher accelerations in the barrel. Reverse engineering the trajectory from the previous sentence indicates a
ballistic coefficient In ballistics, the ballistic coefficient (BC, ''C'') of a body is a measure of its ability to overcome air resistance in flight. It is inversely proportional to the negative acceleration: a high number indicates a low negative acceleration—the ...
(G1 BC) of approximately 0.33. After that military ball ammunition loaded with a spitzer bullet fired at a muzzle velocity of with muzzle energy from a long barrel became available. Besides a pointed nose this projectile also had a boat tail to reduce drag. It had a maximum range of . Reverse engineering the trajectory from the previous sentence indicates a
ballistic coefficient In ballistics, the ballistic coefficient (BC, ''C'') of a body is a measure of its ability to overcome air resistance in flight. It is inversely proportional to the negative acceleration: a high number indicates a low negative acceleration—the ...
(G1 BC) of approximately 0.54.


Military users

At one time, the 7×57mm Mauser cartridge saw widespread military use. It was used by: *:User Repetiergewehr M.14. in WWI * * * * * * * *
El Salvador El Salvador (; , meaning " The Saviour"), officially the Republic of El Salvador ( es, República de El Salvador), is a country in Central America. It is bordered on the northeast by Honduras, on the northwest by Guatemala, and on the south b ...
* *
Iran Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...
* * * * * * * * * *


Chambered service weapons

Mauser Model 1893 The Mauser Model 1893 is a bolt-action rifle commonly referred to as the Spanish Mauser, though the model was adopted by other countries in other calibers, most notably the Ottoman Empire. The M1893 was based on the experimental M1892 rifle, whic ...
,
Mauser Model 1895 The Mauser Model 1895 is a bolt operated magazine fed rifle using the 7×57mm Mauser cartridge. It was exported to many overseas powers, including the Chilean forces which adopted as the Fusil Mauser Chileno Mo 1895. It is the first major modific ...
and Mauser Model 1899, Mauser Model 1907,
Mauser Model 1908 The Mauser Model 1908 were series of Gewehr 98 pattern bolt-action rifles. First produced by Deutsche Waffen und Munitionsfabriken (DWM) and Mauser, they were exported to Uruguay and Brazil. In this latter country, Brazilian War Material Industr ...
,
Mauser Standardmodell The Standardmodell rifle (also known as Mauser Model 1924 or Mauser Model 1933) is a bolt-action rifle designed to chamber the 7.92×57mm Mauser cartridge. The rifle was developed in 1924 but entered full-scale production in 1933. Officially ...
,
vz. 24 The vz. 24 rifle is a bolt-action carbine designed and produced in Czechoslovakia from 1924 to 1942. It was developed from the German Mauser Gewehr 98 line, and features a very similar bolt design. The rifle was designed in Czechoslovakia shor ...
, Mondragón rifle, FN Mauser M1930, FN Model D, Remington Rolling Block, Venezuelan
FN Model 1949 The Fabrique Nationale Model 1949 (often referred to as the FN-49, SAFN, or AFN (automatic rifle version) is an autoloading battle rifle designed by Belgian small arms designer Dieudonné Saive in 1947. It was adopted by the militaries of Argen ...
, Hotchkiss Model 1922 machine gun,
Madsen machine gun The Madsen is a light machine gun that Julius A. Rasmussen and Theodor Schouboe designed and proposed for adoption by Colonel Vilhelm Herman Oluf Madsen, the Danish Minister of War, and that the Royal Danish Army adopted in 1902. It was the wo ...
, Colt R75 Browning Automatic Rifle model 1925, M1941 Johnson, ZB vz.26,
Type 3 heavy machine gun , also known as the Taishō 14 machine gun, was a Japanese air-cooled heavy machine gun. Design The Type 3 heavy machine gun was based on the design of the Hotchkiss M1914. Although the Hotchkiss used 8mm cartridges, from 1914 Japan produced the ...
.


Use as a parent case

6.5×57mm Mauser The 6.5×57mm Mauser (designated as the 6,5 × 57 by the C.I.P.) is a smokeless powder rimless bottlenecked centerfire rifle cartridge developed by Paul Mauser and introduced in 1893–94. Overview The 6.5×57mm Mauser was designed and intro ...
was created by Paul Mauser himself by necking down the 7×57mm already in 1890s. 5.6×57mm was created by RWS in 1960s in a similar way. Both cartridges also have rimmed variants for break-action hunting rifles, 6.5×57mmR and 5.6×57mmR respectively. The
.257 Roberts The .257 Roberts, also known as .257 Bob, is a medium-powered .25 caliber rifle cartridge. It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the 5 mm (.22") and 6 mm (.24"), and ...
uses the 7×57mm Mauser as its parent cartridge. The
6mm Remington The 6mm Remington rifle cartridge, originally introduced in 1955 by Remington Arms Company as the .244 Remington, is based on a necked down .257 Roberts cartridge (itself a necked-down 7×57mm Mauser) using a .24/6mm bullet. Known for a combinat ...
is also based on the 7×57mm Mauser cartridge. The 7x57mm Mauser was also the parent case of the 6x57mm Mauser developed in 1895.


Wildcats

The 7×57mm Mauser is also used as the parent case for a host of modified variants that are not officially registered with or sanctioned by C.I.P. or its American equivalent,
SAAMI The Sporting Arms and Ammunition Manufacturers' Institute (SAAMI, pronounced "Sammy") is an association of American manufacturers of firearms, ammunition, and components. SAAMI is an accredited standards developer that publishes several Americ ...
. These cartridges are known as
wildcat cartridge A wildcat cartridge, often shortened to wildcat, is a custom cartridge for which ammunition and/or firearms are not mass-produced. These cartridges are often created in order to optimize a certain performance characteristic (such as the power, s ...
s. The US wildcat cartridge developer P.O. Ackley developed several 7×57mm Mauser based wildcat cartridges.P.O. Ackley's wildcats
/ref>
The 7×57mm Mauser Ackley Improved is an alternate version of the 7×57mm Mauser cartridge with 40 degree shoulder. This wildcat was designed to be easily made by rechambering existing firearms, and
fire forming The term fire forming in firearms refers to the process of thermomechanically reshaping a metallic cartridge case to optimally fit a new chamber by firing it within that chamber.Glenn Newick, "The Ultimate in Rifle Accuracy", Stroger Publishing C ...
the ammunition to decrease body taper and increase shoulder angle, resulting in a higher case capacity. Dies for this wildcat chambering are readily available.
The .228 Ackley Magnum is also based on the 7×57mm Mauser cartridge but is also necked down to .228 caliber (5.79 mm). Bullets in this caliber are hard to find but provide greater weight than .223 caliber bullets, up to 100 grains (6.5 g), without excessively quick twist rate.
The .257 Roberts Ackley Improved is a second generation wildcat cartridge based on the .257 Roberts cartridge.


See also

*
List of rifle cartridges List of rifle cartridges, by primer type, calibre and name. File:Cartridge Sample 2.jpg, 350px, From left to right: 1 .17 HM2,2 .17 HMR, 2.5 .17 wsm, 3 .22LR, 4 .22 WMR, 5 .17/23 SMc, 6 5mm/35 SMc, 7 .22 Hornet, 8 .223 Remington, 9 .223 WSSM ...
*
Table of handgun and rifle cartridges This is a table of selected pistol/ submachine gun and rifle/machine gun cartridges by common name. Data values are the highest found for the cartridge, and might not occur in the same load (e.g. the highest muzzle energy might not be in the sa ...
*
7 mm caliber This is a list of firearm cartridges which have bullets in the caliber range. *''Length'' refers to the cartridge case Case or CASE may refer to: Containers * Case (goods), a package of related merchandise * Cartridge case or casing, a fir ...


References


Bibliography

* * * C.I.P. decisions, texts and tables
free current C.I.P. CD-ROM version download (ZIP and RAR format)
{{DEFAULTSORT:7by57mm Mauser Pistol and rifle cartridges Military cartridges Weapons and ammunition introduced in 1893