8×50mmR Lebel

The 8×50mmR Lebel was the first smokeless-powder cartridge adopted by any army, entering French service in 1886 as the round for the tube-magazine Lebel Model 1886 rifle. It was made by necking down the earlier 11×59mmR Gras black-powder case to 8 mm, which is why its body carries an unusually sharp double taper and a thick rim rather than the cleaner bottleneck of the smaller-calibre cartridges it inspired abroad.

Its rifle’s tube magazine, rather than the cartridge’s ballistics, drove most of what makes the round distinctive. A flat-nosed bullet (balle M) was mandatory at first so a pointed tip could not set off the primer of the round in front of it; a circular groove machined around the primer cup, adopted alongside the pointed, boat-tailed balle D in 1898, later solved that problem and let France field the world’s first spitzer boat-tail military bullet. The balle D was replaced in the early 1930s by the heavier, steel-jacketed balle N, built for the Hotchkiss machine guns then in French service; rifles rechambered for it were stamped N on the barrel. The case’s taper, well suited to a tube magazine, fed poorly from the box magazines of later rifles such as the Berthier, and is the reason those magazines were built with a visible curve.

The cartridge remained in first-line French service through both world wars before being declared obsolete and replaced by the rimless 7.5×54mm French after 1945.

This entry’s dimensions and maximum pressure are transcribed from the C.I.P.’s own TDCC datasheet for the round, filed under its C.I.P. designation “8 x 51 R Lebel”. No barrel length is published alongside either historical bullet’s velocity, on Wikipedia or elsewhere freely available, so no muzzle velocity is recorded for the Balle D or Balle N loads — only their bullet masses, which are themselves uncited on Wikipedia and are carried here as estimated rather than verified. No ballistic coefficient for either bullet was found.