The 9mm round measures .356 inch in diameter. a 380 is 95 gr 9mm 124gr 40 is180 gr 45 is 230 gr
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9 mm = 0.35433 in
.4005 inches.
"Powerful" is somewhat of a subective term, but the answer is yes. 5.56 is a rifle cartridge and 9mm, assuming you mean 9mm parabellum, is a handgun cartridge. Under normal circumstances, bullets fired from rifles will have more velocity and more muzzle energy than bullets fired from handguns.
9mm is cheeper cause it's a smaller round.
Caliber is a term used to describe the diameter of a bullet in SAE units. 100 Caliber = 1 inch a 45 caliber bullet has a diameter of .45 inches.