How Many Inches Is 57 Mm – The 7×57mm Mauser (referred to as 7mm Mauser or 7×57mm by SAAMI and 7×57 by C.I.P.) is the first generation rimless smokeless rifle cartridge. It was developed by Paul Mauser of the Mauser company in 1892 and was adopted by Spain as a military cartridge in 1893.
It was later adopted by several other countries as the standard military round, and although it is now obsolete as a military round, it remains in wide international use as a sporting round. The 7×57 Mauser (originally known as the .275 Rigby in Britain) was a popular stalking cartridge, and sporting rifles chambered in this chamber were produced by famous British rifle makers such as John Rigby, Holland and Holland, Westley Richards, and others. British cartridge nomenclature indicated caliber in inches and the cartridge was known as .275 caliber after the 7mm rifle caliber measurement across countries.
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A modern 7mm Mauser cartridge next to two 7.92mm Mauser cartridges (FMJ round nose bullets and Spitzer bullets)
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Paul Mauser visited the Kingdom of Spain in 1892 after delivering test rifles in 1891 and brought with him a new rifle designed to use the new 7mm cartridge. Judging by the case dimensions, it was developed from the Mauser Patrone 88 adopted into German service: in fact a derivative, the 6.5×57mm Mauser, was marketed as the M88/57/6.5 mit und ohne Rand in the 1921 catalog.
As well as the 7.65×53mm Mauser introduced in 1889, he developed the 7×57mm Mauser cartridge for use with the new smokeless propellant, introduced as Poudre B in the 8mm Lebel pattern, (1886) which started a revolution in military rifle ammunition . During its development, the 7×57mm Mauser was a high performance smokeless powder cartridge.
The Mauser Model 1892 rifle proved to be a transitional design that was produced in limited numbers for the Spanish Army.
It was quickly upgraded to the Mauser Model 1893 with a new internal magazine where the cartridges were stored in an offset column. The Spanish were so impressed with the Mauser Model 1892 and 1893 rifles and their new Mauser 7×57mm cartridge that they not only ordered rifles and ammunition from Mauser, but also awarded him the Grand Cross of the Spanish Military Order of Merit, the highest decoration Mauser had ever received.
O) cartridge capacity. The outer case shape has been designed to support reliable case feeding and extraction in both bolt-action rifles and machine guns under extreme conditions.
Americans would define the shoulder angle at alpha/2 ≈ 20.55 degrees. Common twist rate for this hub is 220 mm (1 in 8.66 in), 4 splines, face diameter = 6.98 mm (0.275 in), spline diameter = 7.24 mm (0.285 in), spline width = 3, 90 mm (0 .in) and the initial type is a large rifle.
According to the official C.I.P. (Commission Internationale Permante pour l’Epreuve des Armes à Feu Portatives) has determined that the 7×57mm case can handle up to 390.00 MPa (56,565 psi) P
Piezo pressure V C.I.P. regulated countries, 125% of this maximum C.I.P must be demonstrated for each combined rifle cartridge. push for certification for sale to consumers.
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This lower specification is in contrast to the Remington Rolling block rifles that may still be in circulation. Concerns about early Mauser rifles such as the 93 and 95 models are misplaced,
As the original ammunition issued with the M93 Spanish Mauser produced an average pressure of 50,370 CUP in these rifles.
Shortly after its introduction, a 7x57mm rimfire cartridge was developed for use in breaching rifles and combination weapons. A rimmed cartridge greatly simplifies extractor design problems, especially for a combination weapon or “bore”, which must also be designed to extract rimmed shotguns. While various modern rifle and pistol designs have been developed that can reliably eject rimless cartridges, most date from the 1970s or later.
While the external dimensions are almost identical for both versions except for the rim, there are differences in the internal design. In particular, the cartridge belt, the area immediately above the rim on the rimmed version or the half-groove on the rimless version, is thinner in the rammed case, and some authorities recommend limiting the rimmed cartridge to 41,000 CUP because of this.
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The 7×57mm ballistics have become popular with deer and plains hunters. The relatively flat trajectory and manageable recoil secured its place as a sportsman’s round. The 7×57mm can offer very good marksmanship due to its fast twist rate, which allows it to fire long, heavy bullets with a high cross-section. This made it popular in Africa, where it was used on animals up to and including elephants, for which it was particularly favored by the famous ivory hunter W.D.M. “Karamojo” Bell, who shot about 800 African elephants with 7×57mm 1893 pattern military ball ammunition using Rigby Mauser 98 rifles, while most ivory poachers used larger caliber rifles.
Bell chose a cartridge for moderate recoil and relied on 11.2 gram (172.8 g) long military all-metal round nose bullets for petering.
The 7×57mm was also the favorite cartridge of Eleanor O’Connor, wife of the famous hunter and author Jack O’Connor. Eleanor accompanied her husband on several hunting trips around the world, killing both small and large game in 7×57mm. Jack O’Connor also got a lot of use out of the round, noting that “I think I have seen more game killed with fewer shots from this humble little cartridge than with any other.”
Although not as popular today, 7×57mm is still produced by most major ammunition manufacturers and many modern rifles are available chambered. The cartridge is more popular in Europe than in the US, and most European gun manufacturers chamber rifles in 7×57mm. (Although they don’t export them to the US.)
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The 7×57mm cartridge was also used by Indian hunter and conservationist Jim Corbett to take down the infamous man-eating leopard of Rudraprayag, besides several other man-eaters of Kumaon. Corbett’s writings indicate the use of a .275 Mauser-Rigby rifle with an attached flashlight to dispatch a leopard on a dark summer night in May 1926. For man-eating tigers, Corbett preferred the .450/400 Nitro Express cartridge in a double-barreled configuration. by W.J. Jeffery & Co as the .400 Jeffery Nitro Express rifle, but retained the Mauser-Rigby as a backup weapon.
The 7×57 is capable of handling a wide range of bullet weights, is easy to load, has relatively mild recoil, and is accurate. Some rifles are used by shooters with a metallic silhouette in 7×57.
The Army of the Kingdom of Spain adopted the Mauser Model 1893 rifle. It was chambered for the new 7×57 mm Mauser cartridge. The original round had a long, 11.2 gram (173 gr) round nose, all-metal jacket bullet with a muzzle velocity of about 700 m/s (2,300 ft/s) with a muzzle energy of 2,744 J (2,024 ft⋅lbf) 740 mm (29.1 in) cannon guns.
In the late 19th century, this ballistics was impressive and the load provided a fairly flat trajectory combined with excellent petering. At the same time, it showed a relatively mild free regression. It was a combination of attributes that made him popular with soldiers and athletes alike.
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The qualities of 7×57 mm as a military round were shown in the Spanish-American War in 1898. At the beginning of the American attack on the strategic Cuban city of Santiago, 750 Spanish soldiers defended positions on San Juan and Kettle hills. The assault force numbered about 6,600 American troops, most of them armed with the new smokeless .30-40 Krag Krag-Jørgs rifles,
And supported by artillery and Gatling fire. Although the attack was successful, the Americans suffered more than 1,400 casualties, nearly 20 percent of their force. An American commission of inquiry later concluded that the casualties were caused primarily by the superior firepower of the Spanish Mauser Model 1893 rifle.
During the Second Boer War in South Africa, the British authorities were forced to reconsider rifle and ammunition design and tactics after encountering Boer riflemen and snipers armed with Mauser Model 1893 and Mauser Model 1895 rifles firing 7×57mm cartridges with dry efficiency. lighten. the outrage of the .303 British cartridge in terms of accurate fire at long ranges.
The British .303 cartridge at the time still used cordite propellant, as opposed to the more powerful ballistic smokeless Mauser powder.
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The earliest military ball ammunition from 1893 was loaded with an 11.2 gram (172.8 g) long round bullet fired at a muzzle velocity of 670 m/s (2,198 ft/s) with 2,514 J (1,854 ). ft⋅lbf) muzzle energy from a 589 mm (23.2 in) long barrel. It had a maximum range of 3,250 m (3,554 yd).
In 1893, this ballistic performance made it the high performance service cartridge champion of its day when compared to other pattern 1893 smokeless cartridges such as the 8mm Lebel, .303 British, and 8×50mmR Mannlicher.
In 1913, following the lead of Frcha and the German Army in developing the bullet shape or pointed projectile, the Spanish Ordnance Authority issued a revised 7×57mm machine gun bullet cartridge (7mm Cartucho para Mauser Tipo S).
It was loaded with a 9-gram (138.9 gr) bullet fired at a muzzle velocity of 850 m/s (2,789 ft/s) with a muzzle energy of 3,251 J (2,398 ft⋅lbf) in a 589.mm (23.2 in) long barrel.
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