Quote:
Originally Posted by Botnst
If you compare shot-for-shot then yes, a larger mass carries more energy than a smaller mass at equal velocity. E = 0.5mv^2. However, the weapon is not used as a single shot firearm at long range. It is an urban weapon and is rapid fired at close range. 2-3 shot groups fired in very close succession means that the group has 2-3 times the energy on target as a single shot. Because it has minimal recoil and swings on target quickly, the 2-3 shot groups get on target more quickly than a long-gun, given the constraints of human reaction time and strength -- Take two objects of equal mass: can you lift & turn them equally if one is quite long relative to the other?
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I know you know this B, but add the MP7, it is designed specifically for close quarters and armor piercing ammunition which is the reason it used a fast smaller caliber bullet, the smaller bullet penetrates armor better because it has less surface area to penetrate. If you want to do a home experiment get a piece of cardboard and see how much energy it takes to push a sharpened pencil through, then get anything blunt of the same or larger diameter and see what happens. People get the misconception that 5.56 and smaller are less effective because they picture the little 22LR they played with as kids.
http://www.youtube.com/watch?v=YjY0Us7NOns