What does the 1 in 1:8 twist rate denote?

What does the 1 in 1:8 twist rate denote?

• A. One rotation of rifling
• B. One inch of rifling per turn
• C. Eight inches per rotation
• D. One centimeter per turn

Answer: (A)

Twist rate shows how quickly the rifling twists as you go along the barrel. The expression 1:8 is read as one complete turn of the rifling occurring over eight inches of barrel length. The number 1 in this pair specifically denotes that there is one full rotation of the rifling. The eight is the distance over which that single rotation happens, so the whole rate is one rotation per eight inches. In other words, the 1 signifies one full twist, while the 8 tells you how far along the barrel that twist travels.

Twist rate shows how quickly the rifling twists as you go along the barrel. The expression 1:8 is read as one complete turn of the rifling occurring over eight inches of barrel length. The number 1 in this pair specifically denotes that there is one full rotation of the rifling. The eight is the distance over which that single rotation happens, so the whole rate is one rotation per eight inches. In other words, the 1 signifies one full twist, while the 8 tells you how far along the barrel that twist travels.