What defeats body armor?

I'm just wondering cause i was looking into vests... Class III can stop 7.62 x 63 mm 180 GR, SP going 2540 ft./sec... which equals out to 2,487 ft.lbs.... How about a littler 110 grain which is hot loaded? 110 grain loaded with 60.5 grains of IMR 4320?? vel. is 3470.... crunch the numbers and that's... show more I'm just wondering cause i was looking into vests...

Class III can stop 7.62 x 63 mm 180 GR, SP going 2540 ft./sec... which equals out to 2,487 ft.lbs....
How about a littler 110 grain which is hot loaded? 110 grain loaded with 60.5 grains of IMR 4320?? vel. is 3470.... crunch the numbers and that's 2,941 ft. lbs at the muzzle.. Lighter round, but going faster and hitting harder.... How about the 250 grain 06 rounds? Which are going slower, but are packing over 3,000 ft. lbs
Update: Well yeah i figured that AP rounds would take the armor down, but not every thug has those.. I was just talking regular bullets
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