The 10 mm numbers guy will explain to you that his favored cartridge fires a bullet that is heavier than your .357 Mag. He’ll tell you that it has more momentum than your 9 mm. He’ll jeer that it has more foot-pounds of energy at 100 yards than your .45 ACP has at the muzzle; never mind that your .45 is bigger at 100 yards than his 10 mm is at the muzzle and, besides, nobody’s ever even seen a foot-pound. Are they even real?
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