it is less than because 1cm. = 10mm. so 9cm. is 90mm. and then you add the 9mm. to that 90mm.
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AP diameter of 9mm in the midline means the front-to-back distance in the middle of the structure is less than a half inch.
The 9mm round measures .356 inch in diameter. a 380 is 95 gr 9mm 124gr 40 is180 gr 45 is 230 gr
.355
"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.
0.354