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1isaac.eck
I am a gun nut. But I don't know much, one of my questions is: 9MM, .45, ect. What do they mesure?
5sdalcher
9mm and .45 are actually the diameter of the bullet fired, though depnding on gun make etc. sometimes the bullet size slightly different. The 9mm is .380 or 380 thousandths of an inch while the .45 is 450 thousandths of an inch in diameter. Though this does not really tell the whole tale as a .380 is also 380 thousandths of an inch but the shell casing is smaller and so contains less propellant.
