If the barrel extension is not held square with the bore of the receiver only some of the bolt lugs will catch the thrust. A few thousandths will create unequal loading on the lugs and bolt breakage.Īdd to your list-out of square receiver. It only takes a few thousandths of machining error to create a tolerance issue with the bolt and extension surfaces. I would STILL believe that you have a bad extension, or have an extension/bolt tolerance stacking issue, with both measuring correctly separately, and with the gun closing on go/no go gauges, (which I am willing to bet is the ONLY method your gunsmith used to test your tolerances). Since WOLF is known to be a mild load, you really have a conundrum. So if you are 100% sure that your bolts are good and your extension is good, the ONLY thing remaining is your pressure creator, your ammunition.
(The exception in the Grendel MIGHT be old Les Baer Grendel 123 Sierra ammunition, which many users reported was fairly hot.) High pressure in Wolf Grendel loads would be incredibly unlikely, in light of the data that many users have discussed regarding velocities. Since the VAST majority of Grendels have never broken a bolt, and since the vast majority of users are shooting factory ammunition (just like virtually every other factory caliber), high pressure in factory loads is apparently very rare. This included bad metallurgy, bad heat treatment, bad machining, etc.Ģ) Bad barrel extension or a combination of tolerance stacking between the bolt and barrel extension. Broken bolts can only come from 3 things really:ġ) Bad bolt.
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