Originally Posted by
Larry Gibson
Ralf
centrifugal force of RPM.
Let's take a 12" twist as the math is easier; the bullet will make 300 revolutions in traveling 100 yards. If it gets there in one second it is turning 18,000 RPM (300 x 60 seconds) If it gets there in 1/10 of a second it is turning 180,000 RPM. There is a lot of difference in centrifugal force there, eh? Thus even though they both turn the same revolutions getting there the higher velocity bullet is actually spinning much faster. If the second bullet had the same flight time of 1 second as the first how many revolutions would it have made? The answer is 3,000. So given 1 seconds of flight time for both bullets the slow bullet makes 300 revolutions and the fast bullet Makes 3,000 revolutions. See the difference?
It is true that some jacketed bullets are more accurate at higher velocity in slower twists but this has to do with rotational stability of the bullet.
Larry Gibson