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Headspace (firearms)
In firearms, headspace is the distance measured from a closed chamber's breech face to the chamber feature that limits the insertion depth of a cartridge placed in it. Used as a verb by firearms designers, ''headspacing'' refers to the act of stopping deeper cartridge insertion. The exact part of the cartridge that seats against the limiting chamber feature differs among cartridge and gun designs. Davis, William C., Jr. ''Handloading'' (1981) National Rifle Association pp.67-69 In general, bottleneck rifle cartridges headspace on their case shoulders; rimmed cartridges headspace on the forward surfaces of their case rims; and rimless pistol cartridges headspace on their case mouths. The case belts on belted cartridges were originally added to allow headspacing on the belt's forward surface, But in practice, this is often vestigial, and rifles chambered for belted cartridges may well headspace them on their shoulders and still be within CIP or SAAMI dimensional limits. Howev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Headspace
Headspace may refer to: Science and technology * Headspace gas chromatography, a technique in analytical chemistry * Headspace or ullage, the unfilled space in a container * Headspace technology, the gaseous constituents of a closed space above liquids or solid emitting and vapors measured using headspace gas chromatography * Headspace (firearms), a chamber measurement * Headroom (photographic framing), a concept of aesthetic composition in imaging Companies and organizations * Headspace (company), an online healthcare company specializing in meditation * Headspace (organisation), an Australian non-profit organization for youth mental health Culture * Headspace (slang), a term for mental world shared between multiple identities within the multiplicity (also called plurality) subculture Arts and entertainment Music * Headspace (band), a British progressive metal band formed in 2006 * ''Headspace'' (Ashton Nyte album), 2005 * ''Headspace'' (Issues album), 2016 * ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
300 H&H Magnum
3 (three) is a number, numeral (linguistics), numeral and numerical digit, digit. It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number. It has religious and cultural significance in many societies. Evolution of the Arabic digit The use of three lines to denote the number 3 occurred in many writing systems, including some (like Roman and Chinese numerals) that are still in use. That was also the original representation of 3 in the Brahmic numerals, Brahmic (Indian) numerical notation, its earliest forms aligned vertically. However, during the Gupta Empire the sign was modified by the addition of a curve on each line. The Nāgarī script rotated the lines clockwise, so they appeared horizontally, and ended each line with a short downward stroke on the right. In cursive script, the three strokes were eventually connected to form a glyph resembling a with an additional stroke at the bottom: ३. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
303 British
The .303 British (designated as the 303 British by the C.I.P. and SAAMI) or 7.7×56mmR, is a calibre Rim (firearms)#Rimmed, rimmed Tapering (firearms), tapered bottleneck centerfire rifle Cartridge (firearms), cartridge. The .303-inch bore diameter is measured between rifling Rifling, lands as is the common practice in Europe which follows the traditional black powder convention. It was first manufactured in United Kingdom, Britain as a stop-gap black powder round put into service in December 1888 for the Lee–Metford rifle. From 1891 the cartridge used smokeless powder which had been the intention from the outset, but the decision on which smokeless powder to adopt had been delayed. It was the standard British and Commonwealth of Nations, Commonwealth military cartridge for rifles and machine guns from 1889 until it was replaced by the 7.62×51mm NATO in the 1950s. Cartridge specifications The .303 British has a 3.64 litre, mL (56 grain (measure), gr H2O) cartridge case capa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Out-of-battery
Out-of-battery refers to the status of a firearm before the action has returned to the normal firing position. Description The term originates from artillery, referring to a gun that fires before it has been pulled back. In artillery guns, "out of battery" usually refers to a situation where the recoiling mass (breech and barrel) has not returned to its proper position after firing because of a failure in the recoil mechanism. Most gun carriage designs should prevent this; however, if a gun is fired out of battery, then damage to the carriage can occur, as the effectiveness of the recoil mechanism will have been compromised. In firearms and artillery where there is an automatic loading mechanism, a condition can occur in which a live round is at least partially in the firing chamber and capable of being fired, but is not properly secured by the operating mechanism, known as the bolt in handheld firearms, of that particular weapon. The gas pressure produced at the moment of firing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Go/no Go Gauge
A go/no-go gauge is an inspection tool used to check a workpiece against its allowed tolerances via a go/no-go test. Its name is derived from two tests: the check involves the workpiece having to pass one test (''go'') and fail the other (''no-go''). For example, ISO 1502 sets a standard for screw threads and gauging to test them. It establishes the attribute ''T'' as ''go'' for the major diameter and the attribute ''Z'' as ''no-go'' for the pitch diameter. The inspection tool has two threaded components. For example, there would be two female sections on a gauge to test a threaded male workpiece such as a screw. If the major diameter of a screw is too large, it will not fit in the ''T'' test thread at all (fail). If the major diameter is too small, the fit is sloppy (fail). If the thread has been cut too deep, it screws into the ''Z'' test thread (fail). If it is the right size and only does about three turns, the fit is right (pass). A go/no-go gauge is an integral part of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Go & No-Go Gauge
Go, GO, G.O., or Go! may refer to: Arts and entertainment Games and sport * Go (game), a board game for two players * ''Travel Go'' (formerly ''Go – The International Travel Game''), a game based on world travel * Go, the starting position located at the corner of the board in the board game ''Monopoly (game), Monopoly'' * ''Go'', a 1992 List of CD-i games, game for the Philips CD-i video game system * ''Go'', a large straw battering ram used in the Korean sport of Gossaum * Go!, a label under which U.S. Gold published ZX Spectrum games * Go route, a pattern run in American football * Go series, ''Go'' series, a turn-based, puzzle video game series by Square Enix, based on various Square Enix franchises * ''Angry Birds Go!'', a kart racing game based on the ''Angry Birds'' series released in 2013 * ''Counter-Strike: Global Offensive'' (''CS:GO''), a first-person shooter developed by Valve * ''Pokémon Go'', an augmented reality game based on the ''Pokémon'' series Film * Go ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centerfire Ammunition
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, rifle A rifle is a long gun, long-barreled firearm designed for accurate shooting and higher stopping power, with a gun barrel, barrel that has a helical or spiralling pattern of grooves (rifling) cut into the bore wall. In keeping with their focus o ...s, and shotguns use centerfire ammunition, with the exception of some .17 Rimfire, .17 caliber, 5 mm caliber#Rimfire cart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boxer Primer
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 ammunition, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bullet
A bullet is a kinetic projectile, a component of firearm ammunition that is shot from a gun barrel. They are made of a variety of materials, such as copper, lead, steel, polymer, rubber and even wax; and are made in various shapes and constructions (depending on the intended applications), including specialized functions such as hunting, target shooting, training, and combat. Bullets are often tapered, making them more aerodynamic. Bullet size is expressed by weight and diameter (referred to as "caliber") in both imperial and metric measurement systems. Bullets do not normally contain explosives but strike or damage the intended target by transferring kinetic energy upon impact and penetration. Description The term ''bullet'' is from Early French, originating as the diminutive of the word ''boulle'' (''boullet''), which means "small ball". Bullets are available singly (as in muzzle-loading and cap and ball firearms) but are more often packaged with propellant as a cartri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smokeless Powder
Finnish smokeless powder Smokeless powder is a type of propellant used in firearms and artillery that produces less smoke and less fouling when fired compared to black powder. Because of their similar use, both the original black powder formulation and the smokeless propellant which replaced it are commonly described as gunpowder. The combustion products of smokeless powder are mainly gaseous, compared to around 55% solid products (mostly potassium carbonate, potassium sulfate, and potassium sulfide) for black powder. In addition, smokeless powder does not leave the thick, heavy fouling of hygroscopic material associated with black powder that causes rusting of the barrel. Despite its name, smokeless powder is not completely free of smoke; while there may be little noticeable smoke from small-arms ammunition, smoke from artillery fire can be substantial. Invented in 1884 by Paul Vieille, the most common formulations are based on nitrocellulose, but the term was also used to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Commission Internationale Permanente Pour L'Epreuve Des Armes à Feu Portatives
In-Commission or commissioning may refer to: Business and contracting * Commission (remuneration), a form of payment to an agent for services rendered ** Commission (art), the purchase or the creation of a piece of art most often on behalf of another * A contract for performance or creation of a specific work * Commissioning (other), a process or service provided to validate the completeness and accuracy of a project or venture Government Civil * A government agency, regulatory agency or statutory authority which operates under the authority of a board of commissioners, including: ** Independent agencies of the United States government *An executive branch of government, often with characteristics of other branches of government: ** Town commissioners, elected local government bodies established in urban areas in Ireland in the 19th century ** City commission, a form of local government (common in the United States) ** The European Commission, a body incorporating fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Belted Magnum
The term belted magnum or belted case refers to any cartridge, but generally a rifle cartridge, with a shell casing that has a pronounced "belt" around its base that continues past the extractor groove. This design originated with the British gunmaker Holland & Holland for the purpose of headspacing certain more powerful cartridges. Non-shouldered (non-"bottlenecked") magnum rifle cartridges especially could be pushed too far into the chamber and thus cause catastrophic failure A catastrophic failure is a sudden and total failure from which recovery is impossible. Catastrophic failures often lead to cascading systems failure. The term is most commonly used for structural failures, but has often been extended to many ot ... of the gun when fired with excessive headspace. The addition of the belt to the casing prevented over-insertion, while allowing smoother feeding from a box magazine compared to a rimmed cartridge. An example of an American adaption of this practice is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
