Quote:
Originally Posted by Littlebear
"AR bullet velocity is like 2-3x than a handgun or something which is a huge difference on impact."
Physics 101: F=MxV
Force = mass x velocity.
Murf
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That is correct for Force, but bullet energy is typically measured as kinetic energy.
The bullet kinetic energy is calculated as KE = 1/2 x M x V x V One-half of mass times velocity squared. We also calculate muzzle energy as M x V x V, which is how most ammunition manufacturers calculate the muzzle energy. So, yes, velocity matters. It is the high velocity of the bullet that makes the difference in terminal performance.
You are right that rifles are better killing machines than pistols, which is why we use rifles when we can. We carry pistols because they are easier to carry. The compromise in ballistics is worth the benefit of not having to carry a rifle.
The reason rifles have more velocity than pistols is because rifles use more gun powder and less bullet.
For example:
9mm pistol bullet weighing 124 grains has a MV around 1,100 fps.
5.56mm rifle bullet at 55 grains has a MV of 2,900 fps.