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9mm is .34 inches unless you were talking length but that is 18mm .68 inchesHmmm ... I respect the .45's mass and energy, but I have significant accuracy issues with a .45 ...
But I assure you that two 0.63" projectiles (from my 9mm Service XD) rattling around inside a skull will - not might or could, but WILL - create sufficient damage to instantly stop an errant bad guy.