|
220 Swift
The .220 Swift (5.56×56mmSR) is a semi-rimmed rifle cartridge developed by Winchester and introduced in 1935 for small game and varmint hunting. It was the first factory-loaded rifle cartridge with a muzzle velocity of over . Description The velocity of the cartridge ranges from up to about . The Swift is a large-cased .224 caliber cartridge and bullet that was created for small game such as prairie dogs, groundhogs, marmots and other vermin (or "varmints" in the US). When introduced it was faster than its nearest varmint-hunting competitor, which was the .22 Hornet (also .224 caliber). It was found to be an extremely accurate cartridge as well. Due to its very high velocity its bullet drop allows precise sighting to ranges out to , and it is still considered an excellent cartridge for taking varmints by experienced Swift shooters. The original factory load from Winchester provided a bullet launched at . Handloaders could marginally improve on this but only at maxim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
223 Remington
The .223 Remington designated 223 Remington by Sporting Arms and Ammunition Manufacturers' Institute, SAAMI and 223 Rem. by the Commission internationale permanente pour l'épreuve des armes à feu portatives, C.I.P., (pronounced "two-two-three") is a rimless, bottlenecked, centerfire ammunition, centerfire Intermediate cartridge, intermediate cartridge (firearms), cartridge. It was developed in 1957 by Remington Arms and Fairchild Industries for the United States Army Forces Command, U.S. Continental Army Command of the United States Army as part of a project to create a small-caliber, high-velocity firearm. The .223 Remington is considered one of the most popular common-use cartridges and is used by a wide range of Semi-automatic rifle, semi-automatic and manual-action rifles. History The development of the Cartridge (firearms), cartridge, which eventually became the .223 Remington, was linked to the development of a new lightweight combat rifle. The cartridge and rifle were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Overbore
Overbore cartridges are those with a relatively large case volume or case capacity, coupled with a relatively small diameter bullet. The case volume or case capacity and barrel bore area can be mathematically related to obtain a case volume to bore area ratio in metric or imperial units. = \frac where: * Volume_ = the cartridge case internal volume or case capacity (in ml or (for non-metric users) grains of water) * Area_ = barrel bore cross section area (in cm2 or in2) The higher the Oratio result, the more overbore a cartridge will be. As the ratio is expressed in units of length, relatively high Oratio is a good predictor of suitability for relatively long barreled guns. Oratio is also used to predict barrel life in cartridges of the same caliber, but not of different calibres, since the ratio is an extensive quantity that does not correlate to temperature or pressure (e.g. a .50 cal straight cartridge may have the same overbore as a highly necked down .17 cal cartridge). Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dall Sheep
''Ovis dalli'', also known as the Dall sheep or thinhorn sheep, is a species of wild sheep native to northwestern North America. ''Ovis dalli'' contains two subspecies: ''Ovis dalli dalli'' and ''Stone sheep, Ovis dalli stonei''. ''O. dalli'' live in mountainous alpine habitats distributed across northwestern British Columbia, the Yukon, Northwest Territories and Alaska. They browse a variety of plants, such as grasses, sedges and even shrubs, such as willow, during different times of the year. They also acquire minerals to supplement their diet from mineral licks. Like other ''Ovis'' species, the rams engage in dominance contests with their horns. Taxonomy and genetics The species, specific name ''dalli,'' is derived from William Healey Dall (1845–1927), an American naturalist. The common name, Dall's sheep or Dall sheep is often used to refer to the nominate subspecies, ''O. d. dalli''. The other subspecies, ''O. d. stonei'', is called the Stone sheep. Originally, the subsp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burro
The donkey or ass is a domesticated equine. It derives from the African wild ass, ''Equus africanus'', and may be classified either as a subspecies thereof, ''Equus africanus asinus'', or as a separate species, ''Equus asinus''. It was domesticated in Africa some years ago, and has been used mainly as a working animal since that time. There are more than 40 million donkeys in the world, mostly in underdeveloped countries, where they are used principally as draught or pack animals. While working donkeys are often associated with those living at or below subsistence, small numbers of donkeys or asses are kept for breeding, as pets, and for livestock protection in developed countries. An adult male donkey is a ''jack'' or ''jackass'', an adult female is a ''jenny'' or ''jennet'', and an immature donkey of either sex is a ''foal''. Jacks are often mated with female horses (mares) to produce '' mules''; the less common hybrid of a male horse (stallion) and jenny is a ''hinn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrostatic Shock
Hydrostatic shock, also known as hydro-shock, is the controversial concept that a penetrating projectile (such as a bullet) can produce a pressure wave that causes "remote neural damage", "subtle damage in neural tissues" and "rapid effects" in living targets. It has also been suggested that pressure wave effects can cause indirect bone fractures at a distance from the projectile path, although it was later demonstrated that indirect bone fractures are caused by temporary cavity effects (strain placed on the bone by the radial tissue displacement produced by the temporary cavity formation). Proponents of the concept argue that hydrostatic shock can produce remote neural damage and produce incapacitation more quickly than blood loss effects. In arguments about the differences in stopping power between calibers and between cartridge models, proponents of cartridges that are "light and fast" (such as the 9×19mm Parabellum) versus cartridges that are "slow and heavy" (such as the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fallow Deer
Fallow deer is the common name for species of deer in the genus ''Dama'' of subfamily Cervinae. There are two living species, the European fallow deer (''Dama dama''), native to Europe and Anatolia, and the Persian fallow deer (''Dama mesopotamica''), native to the Middle East. The European species has been widely introduced elsewhere. Name The name fallow is derived from the deer's Fallow (color), pale brown colour. The Latin language, Latin word or , used for roe deer, gazelles, and antelopes, lies at the root of the modern scientific name, as well as the German language, German , French language, French , Dutch language, Dutch ', and Italian language, Italian '. In Serbo-Croatian language, Serbo-Croatian, the name for the fallow deer is ''jelen lopatar'' ("shovel deer"), due to the form of its antlers. The Modern Hebrew name of the fallow deer is (). Description The Persian fallow deer is the larger of the two living species, with an average body mass of around , and a s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sika Deer
The sika deer (''Cervus nippon''), also known as the northern spotted deer or the Japanese deer, is a species of deer native to much of East Asia and introduced to other parts of the world. Previously found from northern Vietnam in the south to the Russian Far East in the north, it was hunted to the brink of extinction in the 19th century. Protection laws were enacted in the mid-20th century, leading to a rapid recovery of their population from the 1950s to the 1980s. Etymology Its name comes from , the Japanese word for "deer". In Japan, the species is known as the . In Chinese, it is known as due to the spots resembling plum blossoms. Taxonomy The sika deer is a member of the genus '' Cervus'', a group of deer also known as the "true" deer, within the larger deer family, Cervidae. Formerly, sika were grouped together in this genus with nine other diverse species; these animals have since been found to be genetically different, and reclassified elsewhere under different ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Red Deer
The red deer (''Cervus elaphus'') is one of the largest deer species. A male red deer is called a stag or Hart (deer), hart, and a female is called a doe or hind. The red deer inhabits most of Europe, the Caucasus Mountains region, Anatolia, Iran, and parts of western Asia. It also inhabits the Atlas Mountains of Northern Africa, being the only living species of deer to inhabit Africa. Red deer have been introduced to other areas, including Australia, New Zealand, the United States, Canada, Peru, Uruguay, Chile and Argentina. In many parts of the world, the meat (venison) from red deer is used as a food source. The red deer is a ruminant, characterized by a four-chambered stomach. Genetics, Genetic evidence indicates that the red deer, as traditionally defined, is a species group, rather than a single species, though exactly how many species the group includes remains disputed. The ancestor of the red deer probably originated in central Asia. Although at one time red deer were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryogenic Treatment
A cryogenic treatment is the process of treating workpieces to cryogenic temperatures (typically around -300 °F / -184 °C, or as low as ) in order to remove residual stresses and improve wear resistance in steels and other metal alloys, such as aluminum. In addition to seeking enhanced stress relief and stabilization, or wear resistance, cryogenic treatment is also sought for its ability to improve corrosion resistance by precipitating micro-fine eta carbides, which can be measured before and after in a part using a quantimet. The process has a wide range of applications from industrial tooling to the improvement of musical signal transmission. Some of the benefits of cryogenic treatment include longer part life, less failure due to cracking, improved thermal properties, better electrical properties including less electrical resistance, reduced coefficient of friction, less creep and walk, improved flatness, and easier machining. Processes Cryogenic tempering Cryog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
