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Centerfire
Two rounds of .357 Magnum, a centerfire cartridge; notice the circular primer in the center A center-fire (or centerfire) is a type of metallic cartridge used in firearms, where the primer is located at the center of the base of its casing (i.e. "case head"). Unlike rimfire cartridges, the centerfire primer is typically a separate component seated into a recessed cavity (known as the ''primer pocket'') in the case head and is replaceable by reloading the cartridge. Centerfire cartridges have supplanted the rimfire cartridge, with the exception of a few small calibers. The majority of today's handguns, rifles, and shotguns use centerfire ammunition, with the exception of some .17 caliber, .20 caliber, and .22 caliber rimfire handgun and rifle cartridges, a few small-bore/gauge shotgun shells (intended mainly for use in pest control), and a handful of antiquated rimfire and pinfire cartridges for various firearm actions. History An early form of centerfire ammuniti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
357 Magnum 01
__NOTOC__ Year 357 ( CCCLVII) was a common year starting on Wednesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Constantius and Iulianus (or, less frequently, year 1110 ''Ab urbe condita''). The denomination 357 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * April 28 – Emperor Constantius II enters Rome for the first time to celebrate his victory over Magnentius. He address the Senate and the Roman people. * August 25 – Battle of Strasbourg: Julian, ''Caesar'' (deputy emperor) and supreme commander of the Roman army in Gaul, wins an important victory against the Alemanni at Strasbourg (Argentoratum), driving the barbarians back behind the Rhine. * The Imperial Library of Constantinople is founded. * Ammianus Marcellinus describes the Pantheon as being "rounded like the boundary of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinfire
The pin-fire (or pinfire) is an obsolete type of metallic cartridge used in firearms, where the priming compound is ignited by striking a small pin that protrudes radially from above the base of the cartridge. Invented by Frenchman Casimir Lefaucheux in 1832, but not patented until 1835, it was one of the earliest practical designs of a metallic cartridge to hasten the loading and firing process of a firearm. Its history is closely associated with the development of the breechloader, which would eventually replace all muzzle-loading firearms. The cartridge featured a small pin that, when struck, would ignite the priming compound and initiate the firing process. Despite initial resistance, especially from British gun users, the pinfire cartridge gained popularity following the Great Exhibition of 1851. Its advantages included easier and faster loading than percussion weapons, and it was more likely to fire reliably when wet. However, with the introduction of reliable rimfire ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Handloading
Handloading, or reloading, is the practice of making firearm cartridges by manually assembling the individual components ( metallic/ polymer case, primer, propellant and projectile), rather than purchasing mass-assembled, factory-loaded commercial ammunition. (It should not be confused with the reloading of a firearm ''with'' cartridges, such as by swapping detachable magazines, or using a stripper clip or speedloader to quickly insert new cartridges into a magazine.) The term ''handloading'' is the more general term, and refers generically to the manual assembly of ammunition cartridges. ''Reloading'' refers more specifically to handloading using previously fired cases and shotshells. The terms are often used interchangeably however, as the techniques are largely the same, whether the handloader is using new or recycled components. The differences lie in the initial preparation of cases or shells — new components are generally ready to load straight out of the box, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brass
Brass is an alloy of copper and zinc, in proportions which can be varied to achieve different colours and mechanical, electrical, acoustic and chemical properties, but copper typically has the larger proportion, generally copper and zinc. In use since prehistoric times, it is a substitutional alloy: atoms of the two constituents may replace each other within the same crystal structure. Brass is similar to bronze, a copper alloy that contains tin instead of zinc. Both bronze and brass may include small proportions of a range of other Chemical element, elements including arsenic, lead, phosphorus, aluminium, manganese and silicon. Historically, the distinction between the two alloys has been less consistent and clear, and increasingly museums use the more general term "list of copper alloys, copper alloy". Brass has long been a popular material for its bright gold-like appearance and is still used for drawer pulls and door handle, doorknobs. It has also been widely used to ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Economies Of Scale
In microeconomics, economies of scale are the cost advantages that enterprises obtain due to their scale of operation, and are typically measured by the amount of Productivity, output produced per unit of cost (production cost). A decrease in unit cost, cost per unit of output enables an increase in scale that is, increased production with lowered cost. At the basis of economies of scale, there may be technical, statistical, organizational or related factors to the degree of Market (economics), market control. Economies of scale arise in a variety of organizational and business situations and at various levels, such as a production, plant or an entire enterprise. When average costs start falling as output increases, then economies of scale occur. Some economies of scale, such as capital cost of manufacturing facilities and friction loss of transportation and industrial equipment, have a physical or engineering basis. The economic concept dates back to Adam Smith and the idea o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hang Fire
Hang fire is an unexpected delay between the triggering of a firearm and the ignition of the propellant. This failure was common in firearm actions that relied on open primer pans, due to the poor or inconsistent quality of the powder, although modern firearms are also susceptible. The delay is usually too brief to be noticed, but can be several seconds. A hangfire should be suspected whenever a firearm fails to fire, but has not clearly malfunctioned. Ignition sequence The ignition train of modern firearms begins with detonation of a small quantity of impact-sensitive primary explosive in a primer in cartridge firearms or in a percussion cap in muzzleloaders. The energy released by this detonation is intended to ignite the propellant charge of gunpowder or smokeless powder. Primary explosives may deteriorate with age so they release less energy; and propellants damaged by moisture or lubricants may require more energy to ignite. These conditions may either delay the ignition ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Firearm Malfunction
A firearm malfunction is the failure of a firearm to operate as intended for causes other than user error. Malfunctions range from temporary and relatively safe situations, such as a casing (ammunition), casing that did not eject, to potentially dangerous occurrences that may permanently damage the gun and cause injury or death. Improper handling of certain types of malfunctions can be very dangerous. Following gun safety rules can prevent firearm malfunctions, and limit the damage inflicted by them if they do occur. Proper cleaning and Firearm maintenance, maintenance of a firearm play a big role in preventing malfunctions. Cartridge malfunctions Case head separation Case head separation occurs when the walls of the casing become thin or fatigued. Upon firing the round, the case separates into two pieces near the head. It is not uncommon with brass that has been Handloading, reloaded several times. Dud A dud (also a misfire or failure to fire) occurs when the trigger is pu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centerfire & Rimfire Ignition
file:357 Magnum 01.jpg, Two rounds of .357 Magnum, a centerfire cartridge; notice the circular primer in the center A center-fire (or centerfire) is a type of metallic cartridge used in firearms, where the primer (firearms), primer is located at the center of the base of its casing (i.e. "case head"). Unlike rimfire cartridges, the centerfire primer is typically a separate component seated into a recessed cavity (known as the ''primer pocket'') in the case head and is replaceable by handloading, reloading the cartridge. Centerfire cartridges have supplanted the rimfire cartridge, with the exception of a few small calibers. The majority of today's handguns, rifles, and shotguns use centerfire ammunition, with the exception of some .17 Rimfire, .17 caliber, 5 mm caliber#Rimfire cartridges, .20 caliber, and .22 caliber#Rimfire, .22 caliber Rimfire ammunition, rimfire handgun cartridge, handgun and rifle cartridges, a few small-bore/gauge shotgun shells (intended mainly for use in pes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward Mounier Boxer
Edward Mounier Boxer (c. 1822-1898) was an English people, English inventor. Biography Edward M. Boxer was a colonel of the Royal Artillery. In 1855 he was appointed Superintendent of the ''Royal Laboratory'' of the Royal Arsenal at Woolwich. in 1858 he was elected a Fellow of the Royal Society. He is known primarily for two of his inventions: * The 1865 "Boxer rocket", an early Multistage rocket, two-stage rocket, used for marine rescue line throwing , "Rocket shed brochure" * His 1866 "Centerfire ammunition#Boxer primer, Boxer primer", very popular for centerfire ammunition. Ironically, the British widely adopted the berdan primer, invented by an American, while Boxer's British design was almost universally used for American cartridges. * Also his earlier Artillery fuze#Boxer, time fuze ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hiram Berdan
Hiram Berdan (September 6, 1824 – March 31, 1893) was an American engineer, inventor, military officer, marksman, and guiding force behind and commanding colonel of the United States Volunteer Sharpshooter Regiments during the American Civil War. He was the inventor of the Berdan rifle, the Berdan centerfire primer and other weapons and accessories. Early life Berdan was born in Phelps, a small town in Ontario County, New York. A mechanical engineer in New York City New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ..., he had been the top rifle shot in the country for fifteen years prior to the Civil War. He invented a repeating rifle and a patented Musket#Ammunition, musket ball before the war. He had also developed the first commercial gold amalgamation machine to separate go ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles William Lancaster
Charles William Lancaster (1820–1878) was a British gunmaker and improver of rifles and cannon. Biography Lancaster was the eldest son of Charles Lancaster, gunmaker, of 151 New Bond Street, London. He was born at 5 York Street, Portman Square, London, on 24 June 1820. On leaving school he entered his father's factory, where he practically learnt the business of a gunmaker and soon became a clever designer of models, a thoroughly skilled workman, and a mechanician of high order. The study of rifled projectiles and the construction of rifles was his chief pleasure, and he soon attained the highest skill as a rifle shot. In 1846, Lancaster constructed a model rifle with which he experimented at Woolwich with success at distances of 1,000 and 1,200 yards (920 and 1,100 m). The Duke of Wellington then ordered some similar rifles for the Rifle Brigade at the Cape of Good Hope. The years 1844 and 1845 were devoted to solving the problem of rifled cannon. In July 1846, he submitte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stephen Vincent Benét (general)
Brigadier General Stephen Vincent Benét (January 22, 1827 – January 22, 1895) was a career officer in the United States Army and served as the 8th Chief of Ordnance for the U.S. Army Ordnance Corps. Early life Stephen Vincent Benét was born in St. Augustine, Florida, on 22 January 1827, the son of a prominent political figure of Spanish descent. His grandfather, a native of Minorca, had settled in St. Augustine toward the end of the 18th century, and a great uncle had been a captain in the Spanish Navy. At the age of 12, young Benét entered a private school in Alexandria, Virginia, where he compiled an outstanding record over a period of several years. On the strength of this background, he was admitted to the University of Georgia as a junior, but left before completing his course to enter West Point in June 1845. He was the first cadet ever admitted from his home state of Florida, which had been admitted to the Union just three months previously. Originally determined ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
