Here's three barrels: 22 caliber (.224" groove diameter), 1:8" twist. 30 caliber (.308" groove diameter), 1:11" twist. 44 caliber (..448" groove diameter), 1:16" twist. Which one has the greatest angle the rifling presents to the bullet?

The 1 in 8 twist. The faster the twist the greater the angle. Twist rates are based on the inches it takes for the bullet to make one full revolution= 1in 8 = 1 reveloution in 8" and so fourth. J E CUSTOM

The factors here amount to circumference traveled per bore travel [2 sides of a triangle] InvTan(Pi*Diameter/Travel) All three are ~5 degrees (I think)