canon à âme tronconique

CONT: The Germans designed a gun with a bore actually tapering in diameter from breech to muzzle, and for ammunition they constructed a projectile with a tungsten core and a soft metal body that would deform and squeeze in the reducing bore. The combination of reduced base area and constant gas pressure increased the projectile's velocity, and the ""taper-bore"" or ""squeeze-bore"" gun proved formidable.