10 mm caliber
The 10mm Auto is a powerful semi-automatic pistol cartridge first developed by American Jeff Cooper and introduced in 1983 with the Bren Ten pistol. Its design was adopted and later produced by ammunition manufacturer FFV Norma AB of Åmotfors, Sweden.
Characteristics
At full potential, the 10mm Auto produces energy slightly higher than an average .357 Magnum load and below standard .41 Magnum rounds. The cartridge is considered to be high-velocity, giving it a less-curved flight path upon firing (also termed "flat-shooting") relative to other handgun cartridges. In its lighter loadings, the 10mm Auto is an exact duplicate of the .40 S&W cartridge. More powerful loadings can equal or exceed the performance of the .357 Magnum, and retain more kinetic energy at 100 yards than the .45 ACP has at the muzzle.
The 10mm Auto has 1.56 milliliter (24.1 grain H2O) cartridge case capacity.
Common rifling twist rate for this cartridge is 406.40 mm, 6 grooves, Ø lands = 9.91 mm (.390 in), Ø grooves = 10.17 mm (.4005 in), and land width = 3.05 mm (.120 in).
A large pistol primer is used.
Glaser Silver
Glaser Blue
PMC Bronze