Proof Research .264 16.5" 1:7.5 Bolt Action Rifle Barrel

A 16.5 inch bolt action barrel in a .264 bore with a 1:7.5 twist, which is a fast rate even by current 6.5mm standards. It is there to stabilize the longest, heaviest bullets in the diameter, the ones that hold velocity downrange and shrug off wind better than anything else a short action will chamber.

Short and fast twisted is a specific combination. It suits a suppressed rifle where overall length is already committed at the muzzle, or a truck gun that has to live somewhere other than a case. What you give up is chronograph numbers; what you get back is a rifle that comes out of the vehicle and onto a target without a wrestling match. Proof Research does its own bore and groove work, and that is the part that matters once the chambering is cut. Match the shank and chambering to your action before ordering.