RK, "M2" is the designation for a .30-06 cartridge firing a 152 grain bullet at 2740 FPS measured at 78 feet from the muzzle of the rifle. Muzzle energy is 2656 Ft. Lbs.
However, "Cal. .30 A.P. M2" fires a 168.5 grain bullet at 2715 FPS measured at 78 feet from the muzzle. Muzzle energy is 2780 Ft. Lbs.
"Hatcher's Notebook" has a chapter devoted to developement of the US Cal. .30 service cartridge. If you don't have a copy of the book, it's WELL worth owning.
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