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7.5×54mm French
The 7.5×54mm French MAS or 7.5 French cartridge was developed by France as an update to the 7.5×57mm MAS mod. 1924 cartridge. It replaced the obsolete 8 mm Lebel round used during World War I. In terms of power it is comparable to the 7.62×51mm NATO/.308 Winchester round. The 7.5 French cartridge is somewhat similar in appearance to the slightly longer 7.5×55mm Swiss round but users should never try to interchange the two rounds.
==History & General Information==
By the end of World War I the French Army realized that it needed to update its once revolutionary, but now obsolete, 8 mm Lebel ammunition. Due to the demands of mass production of the 8mm Lebel round during World War I it was not able to do so until the war had ended in November 1918. Six years later, the 7.5×57mm MAS cartridge was introduced in 1924. However it was soon replaced in 1929 with the slightly shorter 7.5×54mm MAS 1924-M29 . Two bullet variations were tested for military use at the time, the 1924 C and 1924 D, the former being lighter than Balle 1924 D. The French Army chose to adopt the lighter Balle C ammunition for universal service in the MAS-36 and MAS-49 rifles as well as in the Mle 1924-29 machine rifle. The heavier Balle 1929 D featured a boat-tailed bullet and had limited specialized use . Common variations of the 7.5×54mm French military round are: armor piercing (Balle AP), tracers (Balle A), incendiary (Balle I), gallery practice and blank. The 7.5mm×54 round is still classified in France as war material. The original French-made ammunition tends to be scarce in the United States and is often corrosive and always Berdan-primed. However, reloadable Boxer-primed 7.5×54mm cartridge cases can be produced by reforming 6.5×55mm Swedish Mauser brass with commercial case forming dies. More recently, the ammunition manufacturer Prvi Partizan has brought onto the U.S. market a freshly manufactured reloadable French MAS 7.5mm×54 ammunition that is non-corrosive and meets all the specifications of the original round.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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