7mm Mauser Ammo
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.275 Rigby is also known as the 7mm Mauser, 7×57mm Mauser, 7mm Spanish Mauser in the USA. It is a first-generation smokeless powder rimless bottlenecked rifle cartridge. It was developed by Paul Mauser of the Mauser company in 1892 and adopted as a military cartridge by Spain in 1893.
Several other countries subsequently adopted it as the standard military cartridge. It recognizes as a milestone in modern cartridge design, and although now obsolete as a military cartridge, it remains in widespread international use as a sporting round.
The Mauser Model 1892 rifle turned out to be a transitional design that manufactures in limited numbers for the Spanish Army. The 7×57mm can offer outstanding penetrating ability due to a fast twist rate that enables it to fire long, heavy bullets with a high sectional density.