here's an article on twist rates relation to stopping power , in handguns . I thought it was worth the read .
www.americanrifleman.org
An Official Journal Of The NRA | Spin Difference: The Impact of Barrel Twist Rates on Terminal Performance
When most shooters think of rifling-twist rates, they mostly think of rifles with their high BC projectiles, but the rpm of a bullet also plays a part in terminal performance.
