Rifling is often described by its twist rate, which indicates the distance the rifling takes to complete one full revolution, such as “1 turn in 10 inches” (1:10 inches), or “1 turn in 254 mm” (1:254 mm). A shorter distance indicates a “faster” twist, meaning that for a given velocity the projectile will be rotating at a higher spin rate.
Button Rifling and Cut Rifling machines are for smaller calibers from 0.22 to 50 BMG. Broach Rifling Machines are for larger artillery barrels.
Click here to read about Button Rifling, Cut Rifling and Broach Rifling.
