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The 7×57mm Mauser (designated as the 7 mm Mauser or 7×57mm by the SAAMI and 7 × 57 by the C.I.P.) is a first-generation
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 formula ...
rimless bottlenecked
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 ...
cartridge. It was developed by Paul Mauser of the
Mauser Mauser, originally the Königlich Württembergische Gewehrfabrik, was a German arms manufacturer. Their line of bolt-action rifles and semi-automatic pistols was produced beginning in the 1870s for the German armed forces. In the late 19th and ...
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. The cartridge is today often erroneously referred to as the ".275 Rigby", however neither Rigby & Sons nor Kynoch (the major UK ammunition manufacturer of the period) sold the cartridge in boxes labeled .275 Rigby - instead it was always marked ".275 bore" (Rigby) or 7mm Mauser (Kynoch) and it is doubtful the cartridge was ever referred to as the ".275 Rigby" during its golden period.


History

Paul Mauser visited the
Kingdom of Spain Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...
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 adopted into German service: in fact, its derivative, 6.5×57mm Mauser, was marketed as ''M88/57/6.5 mit und ohne Rand'' in a 1921 catalog. Like the 7.65×53mm Mauser introduced in 1889, he had developed the 7×57mm Mauser cartridge for use with the new smokeless propellant, introduced as Poudre B in the 1886 pattern 8×50mmR Lebel, 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 featuring a new internal box magazine 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 from 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 le ...
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 Action (firearms), firearm action that is operated by ''directly'' manipulating the bolt (firearms), turn-bolt via a cocking handle, bolt handle, most commonly placed on the right-hand side of the firearm (a ...
rifles and machine guns 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 Rifling is the term for helical grooves machined into the internal surface of a firearms's barrel for imparting a spin to a projectile to improve its aerodynamic stability and accuracy. It is also the term (as a verb) for creating such groov ...
twist rate 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 maximum average pressure (MAP) for this cartridge is piezo pressure or 46,000
CUP A cup is an open-top vessel (container) used to hold liquids for drinking, typically with a flattened hemispherical shape, and often with a capacity of about . Cups may be made of pottery (including porcelain), glass, metal, wood, stone, pol ...
. 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. 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 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 don't export them to the USA.) The 7×57mm round was also used by the Indian hunter and conservationist Jim Corbett to put down the infamous man-eating Leopard of Rudraprayag besides a few other Man-Eaters of Kumaon. Corbett's writings mention using the .275 in a Rigby-made Mauser 1898 sporting 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-barreled configuration from W.J. Jeffery & Co as the .400 Jeffery Nitro Express rifle but retained the Rigby Mauser 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 shooters use 7×57.


Military use

The military of the
Kingdom of Spain Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...
adopted the Mauser Model 1893 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. 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 The Spanish–American War (April 21 – August 13, 1898) was fought between Restoration (Spain), Spain and the United States in 1898. It began with the sinking of the USS Maine (1889), USS ''Maine'' in Havana Harbor in Cuba, and resulted in the ...
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 and one of the largest cities in the Americas. It is located in the country's central valley and is the center of the Santiago Metropolitan Regi ...
, 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 rifles in .30-40 Krag 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 of North Carolina. It is an early machine gun and a forerunner of the modern electric motor-driven rotary cannon. The Gatling gun's operatio ...
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 (, , 11 October 189931 May 1902), also known as the Boer War, Transvaal War, Anglo–Boer War, or South African War, was a conflict fought between the British Empire and the two Boer republics (the South African Republic and ...
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" ...
s and snipers armed with Mauser Model 1893 rifles and Mauser Model 1895 rifles firing 7×57mm rounds with withering effectiveness, easily outranging the .303 British cartridge as regarding 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 Britain since 1889 to replace black powder as a military firearm propellant. Like modern gunpowder, cordite is classified as a low explosive because of its slow burni ...
propellant, in contrast to the Mauser's higher-performance ballistite type
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 formula ...
.


Military ammunition

The oldest 1893 pattern military ball ammunition was loaded with an long round-nosed
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 constru ...
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, .303 British, and 8×50mmR Mannlicher. 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 (''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 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, officially the Republic of 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 by the Pacific Ocean. El Salvador's capital and largest city is S ...
* *
Iran Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
* * * * * * * * * *


Chambered weapons

* Mauser Model 1893 * Mauser Model 1895 and Mauser Model 1899 * Mauser Model 1907 * Mauser Model 1908 * Mauser Standardmodell * vz. 24 *Mendoza 1911 machine gun * Mondragón rifle * FN Mauser M1930 * Remington Rolling Block *Venezuelan FN Model 1949 *
M1895 Colt–Browning machine gun The Colt–Browning M1895, nicknamed "potato digger" because of its unusual operating mechanism, is an air-cooled, belt-fed, gas-operated machine gun that fires from a closed bolt with a cyclic rate of 450 rounds per minute. Based on an 1889 desi ...
* 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 Herman Madsen, Vilhelm Herman Oluf Madsen, the Minister of War (Denmark), Danish Minister of War, and that the Royal Da ...
* SIG KE7 * FN Model D * Colt R75 Browning Automatic Rifle model 1925 * M1941 Johnson * FA Trapote m/33 * Type 3 heavy machine gun * ZB vz.26


Use as a parent case

6.5×57mm Mauser 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 uses the 7×57mm Mauser as its parent cartridge. The 6mm Remington is also based on the 7×57mm Mauser cartridge. The 7×57mm Mauser was also the parent case of the 6×57mm 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. These cartridges are known as
wildcat cartridge A wildcat cartridge, often shortened to wildcat, is a custom-made cartridge (weaponry), cartridge for which ammunition and/or firearms are not mass-produced. These cartridges are often created as experimental variants to optimize a certain ballis ...
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 ...
the ammunition to decrease body taper and increase shoulder angle, resulting in a higher case capacity with the trade-off of a smaller bullet. Reloading 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, Caliber, calibre and name. File:Cartridge Sample 2.jpg, 350px, From left to right: 1 .17 Hornady Mach 2, 2 .17 Hornady Magnum Rimfire, 3 .22 Long Rifle, 4 .22 Winchester Magnum Rimfire, 5 .17/23 SMc, 6 5mm ...
*
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 same ...
*
7 mm caliber This is a list of firearm cartridges which have bullets in the caliber In guns, particularly firearms, but not #As a measurement of length, artillery, where a different definition may apply, caliber (or calibre; sometimes abbreviated a ...


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