The gain twist rifling was used by Smith & Wesson to minimize impact damage done to the forcing cone and frame. Makes for a smooth, easy transition for the bullet. They also wanted to make sure they don't spin the cores out of lighter jacketed bullets. Because of this it doesn't build the same pressure it would with a faster twist up front.


Max Prasac

Semper Fidelis

BIG IRON: https://www.youtube.com/watch?v=L6aXjMH5C30

Gun Digest TV's Modern Shooter: https://www.youtube.com/watch?v=nGo-KMpXPpA&t=7s