Recent from talks
7.5×54mm French
Knowledge base stats:
Talk channels stats:
Members stats:
7.5×54mm French
The 7.5×54mm French, 7.5 French, or 7.5 MAS (designated as the 7,5 × 54 MAS by the C.I.P.) is a rimless bottlenecked rifle cartridge. It was developed by France as an update to the 7.5×57mm MAS mod. 1924 cartridge. It replaced the obsolete 8×50mmR Lebel round used during World War I, and served as the French service cartridge until superseded by the 5.56×45mm NATO and 7.62×51mm NATO cartridges in the 1970s and 1980s.
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. The 7.5 French cartridge is somewhat similar in appearance to the slightly longer and thicker 7.5×55mm Swiss GP11 round but users should never try to interchange the two rounds.
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, in 1924, the 7.5×57mm MAS cartridge was introduced. 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. As a result, a French soldier could potentially chamber a 7.92×57mm cartridge (which were also in fairly extensive use by the French military, e.g. in machine guns obtained as war reparations) and cause a massive failure if fired in a rifle designed for the less powerful and smaller calibre 7.5×57mm. With the newer 54mm case, a 7.92×57mm Mauser round would be too long for the chamber and prevent incorrect ammunition from being used. Two bullet variations were tested for military use at the time, the light bullet Mle 1924 Balle C and heavy bullet Mle 1924 Balle D.[citation needed]
The French Army chose to adopt "light ball" 9.0 grams (139 gr) Balle C flat base spitzer bullet ammunition for universal service in the MAS-36 and MAS-49 rifles as well as in the Mle 1924-29 machine rifle. The "heavy ball" 12.35 grams (190.6 gr) Balle 1929 D featured a boat-tailed spitzer bullet and had limited specialized use in automatic weapons like the Mle 1931 F and the FM Mle 1924M29 machine guns.[citation needed]
Other variations of the 7.5×54mm French military round are: armor-piercing (Balle P [Perforante]), tracer (Balle T [Traçante]), armor-piercing tracer (Balle TP [Traçeuse-Perforante]), incendiary (Balle I [Incendiaire]), gallery practice and blank. The 7.5mm×54 French round is still classified in France as war material.[citation needed]
The 7.5×54mm French has 3.76 ml (58.0 grains H2O) cartridge case capacity. The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt-action rifles and machine guns alike, under extreme conditions.
7.5×54mm French maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm).
Americans would define the shoulder angle at alpha/2 = 20 degrees. The common rifling twist rate for this cartridge is 270 mm (1 in 10.63 inches), 4 grooves, Ø lands = 7.57 mm (0.298 in), Ø grooves = 7.85 mm (0.309 in), land width = 3.70 mm (0.146 in). However, fortress machine guns in the Maginot Line used 235 mm twist rate since they were designed for a heavier, Mle 1933D bullet. The primer type is Berdan (military ammo) or Boxer (some commercial ammo) Large rifle.
Hub AI
7.5×54mm French AI simulator
(@7.5×54mm French_simulator)
7.5×54mm French
The 7.5×54mm French, 7.5 French, or 7.5 MAS (designated as the 7,5 × 54 MAS by the C.I.P.) is a rimless bottlenecked rifle cartridge. It was developed by France as an update to the 7.5×57mm MAS mod. 1924 cartridge. It replaced the obsolete 8×50mmR Lebel round used during World War I, and served as the French service cartridge until superseded by the 5.56×45mm NATO and 7.62×51mm NATO cartridges in the 1970s and 1980s.
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. The 7.5 French cartridge is somewhat similar in appearance to the slightly longer and thicker 7.5×55mm Swiss GP11 round but users should never try to interchange the two rounds.
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, in 1924, the 7.5×57mm MAS cartridge was introduced. 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. As a result, a French soldier could potentially chamber a 7.92×57mm cartridge (which were also in fairly extensive use by the French military, e.g. in machine guns obtained as war reparations) and cause a massive failure if fired in a rifle designed for the less powerful and smaller calibre 7.5×57mm. With the newer 54mm case, a 7.92×57mm Mauser round would be too long for the chamber and prevent incorrect ammunition from being used. Two bullet variations were tested for military use at the time, the light bullet Mle 1924 Balle C and heavy bullet Mle 1924 Balle D.[citation needed]
The French Army chose to adopt "light ball" 9.0 grams (139 gr) Balle C flat base spitzer bullet ammunition for universal service in the MAS-36 and MAS-49 rifles as well as in the Mle 1924-29 machine rifle. The "heavy ball" 12.35 grams (190.6 gr) Balle 1929 D featured a boat-tailed spitzer bullet and had limited specialized use in automatic weapons like the Mle 1931 F and the FM Mle 1924M29 machine guns.[citation needed]
Other variations of the 7.5×54mm French military round are: armor-piercing (Balle P [Perforante]), tracer (Balle T [Traçante]), armor-piercing tracer (Balle TP [Traçeuse-Perforante]), incendiary (Balle I [Incendiaire]), gallery practice and blank. The 7.5mm×54 French round is still classified in France as war material.[citation needed]
The 7.5×54mm French has 3.76 ml (58.0 grains H2O) cartridge case capacity. The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt-action rifles and machine guns alike, under extreme conditions.
7.5×54mm French maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm).
Americans would define the shoulder angle at alpha/2 = 20 degrees. The common rifling twist rate for this cartridge is 270 mm (1 in 10.63 inches), 4 grooves, Ø lands = 7.57 mm (0.298 in), Ø grooves = 7.85 mm (0.309 in), land width = 3.70 mm (0.146 in). However, fortress machine guns in the Maginot Line used 235 mm twist rate since they were designed for a heavier, Mle 1933D bullet. The primer type is Berdan (military ammo) or Boxer (some commercial ammo) Large rifle.