Originally Posted by mjkeat
It's like throwing a football from how I understand it. A good spiral helps it travel further and truer
From what I've seen, a 1:7 twist rate is 1 rotation every 7 inches in the barrel. A 1 to 9 rotation is one rotation ever 9 inches, and, since the bullet is slower, increases maximum range, but at the cost of some velocity. Same for 1:12 and such.