The brunt of the recoil forces are not carried on the threads, in fact, they have a slight clearance. The force is transmitted through the anuli of the end of the bolt body and on the back of the bolt head. These areas will appear as shiny rings when you inspect your bolt.
A sloppy fit with lots of bolt head over turn isnt good, but my belief is that the thread fit being tight isn't that critical. As long as the overturn is within limits, good to go.Information
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