7.5×54mm French

The 7.5×54mm French MAS has an uncommon 12.39 mm (0.488 in) breech and breechface diameter, and it has ballistics comparable to the 7.62×51mm NATO/.308 Winchester round.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.However it lasted only until 1929 when it was replaced with the slightly shorter 7.5×54mm MAS 1924-M29, due to the original cartridge being very similar in size and appearance to the German 7.92×57mm Mauser.However, fortress machine guns in the Maginot line used 235 mm twist rate since they were designed for a heavier, Mle 1933D bullet.[6] (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the 7.5×54mm French can handle up to 380.00 MPa (55,114 psi) Pmax piezo pressure.The reason is that the military Berdan-primed cartridges were made with a specially scored internal annular groove between the head and body to purposely weaken the case and prevent reloading by enemy forces, which had apparently been a problem at one time for the French when they occupied Morocco.The easiest and usually the cheapest way is to rechamber the firearm to something that uses the same barrel and bore, but removes the old military chamber during the re-chambering process.
Belted 7.5×54mm French ammunition for use in the MAC 52 aircraft variant of the AA-52 machine gun.
FranceGermanyVietnamCameroonWorld War IIFirst Indochina WarAlgerian WarSuez CrisisVietnam WarShaba IIAnglophone Crisis7.5×57mm MAS mod. 1924gr H2OBoxer Large rifleC.I.P.rimlesscartridge8×50mmR LebelWorld War I5.56×45mm NATO7.62×51mm NATObreechbreechface.308 Winchester7.5×55mm Swiss8 mm Lebelammunition7.5×57mm MAS7.92×57mm Mauserspitzer bulletMAS-36MAS-49Mle 1924-29 machine rifleMle 1931 FFM Mle 1924M29grainsbolt-actionmachine gunsriflingMaginot lineprimer typeBerdanproofedBerdan-primedMoroccoBoxer-primed6.5×55mmPrvi Partizanrechamberchamberre-chamberingwildcat cartridges.284 Winchestersniper rifleFM 24/29 light machine gunReibel machine gunMAC 1931MAC 1934FN-Browning mle 38AA-52 machine gunList of rifle cartridges7 mm caliber