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The 7.5×57mm MAS or 7.5×58mm mle 1924c was a short-lived French rifle cartridge that was introduced in the mid-1920s to replace the 8×50mmR Lebel, although it itself was soon replaced with the 7.5×54mm French round, that served the French for decades to come until France, along with the rest of NATO, adopted the standard NATO calibers, 5.56×45mm NATO and 7.62×51mm NATO.

7.5 mm MAS
Place of originFrance
Service history
Used byFrance
Production history
Produced1924 to 1929
Parent case6.5×55mm
Case typeRimless, bottleneck
Bullet diameter7.8 mm (0.31 in)
Neck diameter8.6 mm (0.34 in)
Shoulder diameter11.2 mm (0.44 in)
Base diameter12.2 mm (0.48 in)
Rim diameter12.2 mm (0.48 in)
Rim thickness1.4 mm (0.055 in)
Case length57.6 mm (2.27 in)


The obsolete 8mm Lebel round was powerful and accurate but due to its shape it was particularly poorly suited to automatic weapons with large-capacity magazines.[1] The only weapon ever fielded in 7.5 mm MAS mod. 1924 was the fusil-mitrailleur mle 1924, an automatic rifle sharing similarities with the B.A.R and Bren. Early examples of the FM 24 proved prone to various failures; additionally, it was possible to mistake the new 7.5×57mm for a German 7.92×57mm Mauser round. The new 7.5 mm round was abandoned and replaced by the 7.5×54mm MAS mod. 1929.[2]

See alsoEdit


  1. ^ "7.5x54mm MAS".
  2. ^ Ferrard, Stéphane (1998). France 1940 l'armement terrestre. ETAI. ISBN 2-7268-8380-X.