Our bolt face diameter database helps to determine which new caliber or cartridge will work with the bolt face diameter and action length.. By adding larger radii to the face-to-inner wall angles, and to the rear of the lug-bolt shaft junctions, you can re-gain the strength lost from the deeper face. Combine that with certain aerospace-grade alloys in the 9000 series and you have great bolt durability. The new Colt 7.62x39s have a circumferential trench around the bolt face, which is another approach that I hadn't seen before.
This 6mm ARC reloading data is intended for use in bolt action rifles safe for pressures up to 62,000 psi. It is NOT for use in AR-15 style (gas gun) rifles.. Check out J P ENTERPRISES AR-15 6.5 GRENDEL / 6MM ARC COMPLETE BOLT ASSEMBLY ENHANCED with 3 reviews and an overall rating of 5.0, available Online at Brownells Today and many more Rifle Bolts & Bolt Carrier Groups products are available in our Gun Parts Department.