In the 1500s, spiral grooves cut into gun bores were used to spin-stabilize bullets fired through them. While the method of creating these grooves has changed, this system has remained the same and is considered “best” by nearly all barrel makers.
gundigest.com

Rifling Evolution: Cutting Through The Spin On Twists
In this excerpt from the Gun Digest annual, we take a closer look at early rifling development and the twists and turns that led us to today.
