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the original Norma specs for the first 10mm rounds were a 200gr. at 1200 fps and a 170gr. @ 1400 fps.

of course many in the fbi got the job because of college degrees and not policing skills so the round had to be watered down. federal did that first. then s&w figured to take the watered down federal load and put it into a smaller casing so the other fbi persons of petite staure could hold a gun grip with the rounds in it the same as the 9mm or .45acp.

none of the big three or even five make a true 10mm round.

Double Tap used to and still claims to do so today but they havent been living up to specs.....better than the big three but not what they claim on the box at all.

Buffalo bore makes real 10mm ammo but only loads heavy rounds for it, no mid or light weight bullets.

DT is about as close as you can get to real 10mm ammo without spending $1.00 per round. BB is the real deal but your bank account weeps evey trigger put.

of course you could load your own but that can be said for every defensive round.....
 
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