The 7×57mm cartridge, also known as the 7mm Mauser, 7×57mm Mauser, 7mm Spanish Mauser in the USA and .275 Rigby in the United Kingdom, was developed by Paul Mauser of the Mauser company in 1892 and adopted as a military cartridge by Spain in 1893. It was subsequently adopted by several other countries as the standard military cartridge. It is recognized 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 7×57mm has been described as “a ballistician’s delight”. Many sporting rifles in this caliber were made by British rifle makers, among whom John Rigby was prominent; and, catering for the British preference for calibers to be designated in inches, Rigby called this chambering the .275 Rigby, after the measurement of a 7 mm rifle’s bore across the lands.