Barrel twist is rifling inside the barrel that spins the bullet in a clockwise or counter clockwise direction when exiting the barrel. Rifling is described by its twist rate, which indicates the distance the bullet must travel to complete one full revolution, such as "1 turn in 10 inches" A 1 in 16 twist like you have in your rifle is considered a slow twist. A shorter distance indicates a "faster" twist, meaning that for a given velocity the projectile will be rotating at a higher spin rate. The combination of length, weight and shape of a projectile determines the twist rate needed to stabilize it – barrels intended for short, large-diameter projectiles like spherical lead balls require a very low twist rate, such as 1 turn in 48 inches (122 cm).
Barrels intended for long, small-diameter bullets, such as the ultra-low-drag, 80-grain
0.224 inch bullets (5.2 g, 5.56 mm), use twist rates of 1 turn in 8 inches (20 cm) or faster.