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The7.5×57mm MAS or7.5×58mm mle 1924c was a short-lived French riflecartridge that was introduced in the mid-1920s to replace the8×50mmR Lebel, although it itself was soon replaced with the7.5×54mm French round, that served the French for decades to come until France, along with the rest ofNATO, adopted the standard NATO calibers,5.56×45mm NATO and7.62×51mm NATO.

The obsolete8mm 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 thefusil-mitrailleur mle 1924, alight machinegun based on theB.A.R action. Early examples of the FM 24 proved prone to various failures; additionally, it was possible to mistake the new 7.5×57mm for a German7.92×57mm Mauser round. The Mauser round would chamber and fire, but the larger bullet would not fit in the barrel and could cause a catastrophic malfunction. The new 7.5 mm round was abandoned and replaced by the7.5×54mm MAS mod. 1929.^[2]

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