Originally Posted by 2muchgun
Originally Posted by shrapnel
RPM is easily calculated and how many more times a bullet spins in a foot of distance won't make any difference to the critter it shot...


RPM is easily calculated at the muzzle.

Can you calculate RPM after the bullet has traveled 100 yds. or more?

If a bullet leaves muzzle @ 3000fps, 180,000 RPM, what is RPM when it has slowed to 2000 fps?


You don't still think it's 120,000 rpm, do you?