While the external dimensions of the two versions are nearly identical other than the rim, there are differences in the internal design. 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. 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. 7×57mmR (rimmed) Ī rimmed cartridge was developed from the 7×57mm shortly after its introduction for use in break-action rifles and combination guns. Although this lower specification is in deference to the purportedly weaker actions of the older Mauser 93 and 95 rifles which are still in circulation, this concern is misplaced, as the original ammunition developed for, and issued with, the M93 Spanish Mauser produced an average pressure of 50,370 CUP in those rifles. The SAAMI maximum average pressure (MAP) for this cartridge is 51,000 psi (351.63 MPa) piezo pressure or 46,000 CUP. pressure to certify for sale to consumers. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the 7×57mm case can handle up to 390.00 MPa (56,565 psi) P max piezo pressure. American 7 mm cartridges have 7.21 mm (0.284 in) grooves diameter.Īccording to the official C.I.P. The common rifling twist rate for this cartridge is 220 mm (1 in 8.66 in), 4 grooves, diameter of lands = 6.98 mm (0.275 in), diameter of grooves = 7.24 mm (0.285 in), land width = 3.90 mm (0.154 in) and the primer type is large rifle.Įuropean 7 mm cartridges all have 7.24 mm (0.285 in) grooves diameter. All sizes in millimeters (mm).Īmericans would define the shoulder angle at alpha/2 ≈ 20.55 degrees. The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt action rifles and machine guns alike, under extreme conditions.ħ×57mm maximum C.I.P. The 7×57mm cartridge has 3.90 ml (60 grains H 2O) cartridge case capacity. The Spaniards were so impressed with the Mauser Model 18 rifles and their new 7×57mm Mauser cartridge that they not only ordered rifles and ammunition with Mauser, but also awarded him the Grand Cross of the Spanish Military Order of Merit, the highest decoration Mauser ever received. 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 Mauser Model 1892 rifle turned out to be a transitional design that was manufactured in limited numbers for the Spanish Army. At the time of its development 7×57mm Mauser was a high-performance smokeless-powder cartridge. 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 8mm Lebel, which started a military rifle ammunition revolution.
#7MM SPANISH MAUSER TRIAL#
Paul Mauser visited the Kingdom of Spain 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. 275 bore after the measurement of a 7 mm rifle's bore across the lands. Many sporting rifles in this calibre were made by British riflemakers, among whom John Rigby was prominent and, catering for the British preference for calibres to be designated in inches, Rigby called this chambering the. 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. It was developed by Paul Mauser of the Mauser company in 1892 and adopted as a military cartridge by Spain in 1893. The 7×57mm Mauser (designated as the 7mm Mauser or 7×57mm by the SAAMI and 7 × 57 by the C.I.P.) is a first-generation smokeless powder rimless bottlenecked rifle cartridge. Two 7×57mm cartridges next to a 7.5×55mm/GP11 (mid).
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