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I was under the impression that the HPT process was basically subjecting the bolt to a proof test, which also has the effect of potentially shortening the overall life of the bolt by quite a margin. I read that the US army found that bolts (even HPT/MPI tested) will begin to crack at 5,000 rounds, and will generally break at 10,000 rounds.
If bolts tend to let go at the same time, I'm not sure if the benefits of HPT stack up, but interested in others views.
It picks up the bolts with faults that will fail early, well before end of service life. As I understand it. Failing at a predictable interval after many thousand rounds is ok (wearing out), failing at random with low round counts because of metal/machining flaws isn't
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