The 7x57mm Mauser was designed in 1893 by Paul Mauser and is also known as the 7mm Spanish Mauser, .275 Rigby, along with 7mm Mauser. The case is an original design with a rimless, bottleneck type case that fits a .285 inch bullet on a .325 inch neck with a case length of 2.244 inches and overall length of 3.071 inches. It has a large rifle primer with a 1:8.66 twist.
The ballistic performance for the 7.57 Mauser based off three grain types for muzzle velocity are 3,000 ft/s (139 gr), 2,600 ft/s (162 gr), 2,500 ft/s (173 gr RWS HMK), and 2,300 ft/s (173 gr Military load). The 7x57 Mauser has become a popular hunting rifle for shooters, and has been used by militaries such as the Spanish government.
The 7x57 Mauser has a almost flat trajectory along with a moderate recoil when fired. In addition it has good wound penetration on game up to the size of an elephant, which has been noted by such hunters as Walter Bell. Bell was famous for his African Safari hunting expeditions during the early 1900's, but later caliber rounds have replaced big game hunting cartridges such as the 7x57 Mauser. Now it used on game in North America up to the size of moose in most cases.
