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Old October 8, 2012, 09:18 PM   #25
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Join Date: October 20, 2007
Location: Richardson, TX
Posts: 7,333
Also, a bit of terminology...

For the OP:

FYI, the "40" in .40S&W refers to 0.40 inches, not millimeters.

.40mm would be about the size of a sharpened pencil lead- not optimal for terminal performance.

40mm is a real military caliber, but the guns that fire it qualify as light artillery, not small arms. Google "Bofors gun". Not very concealable unless you count the inside of a truck trailer.
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