BSF Barrels 25 Caliber 18" 1:7.5 Twist Rifle Barrel

BSF lists this as a 25 caliber bore barrel, 18" long, with a 1:7.5 twist, cut for bolt action rifles. A twist figure is the distance a bullet travels for one full rotation, so 1:7.5 means one turn every seven and a half inches. That is a fast rate for a quarter bore, and fast rates are there to stabilize bullets that run long for their diameter.

Eighteen inches is at the short end of the range for the bore, which trims weight off the front of the rifle and gives up some velocity in return. Chamber, shank diameter and muzzle thread are not listed for this barrel, so confirm all three against your action and your gunsmith before ordering.