Quote:
Originally Posted by weby
Basically both get stopped by the armor, but in the 5.56x45 from short range from rifle length barrel the armor has to spread about 1750J but with a 7.62x51 from close range you have to spread about 2200J.
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More like 3200J, but what do you mean by 'spread'? Very little of the kinetic energy gets transferred into movement of the plate -- most of it gets expended on heat, sound, possible ricochet and fragments, and deformation or cracking of projectile and plate, and the job of the armor is to make sure most of that occurs on the outside, not the inside.