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Is it perhaps possible that your gun was knocked around a bit before you shot it, after it had been boresighted? All the posters have had very appropriate information so far, but perhaps it's not a disconnect between services, and expectations of results, but rather a simple accidental movement...

The poster directly above me has a good method, at least from a dimensional stability standpoint. You can even hand "lap" it, with a dummy round or a casing and some lapping compound, but try to plug the barrel very close to the edge of the chamber, so you don't lose seal or rifling by even a...

Reloads or fresh factory ammunition? If it is factory, and the dowel test shows a squib or case separation, document it with pictures and ammo case lots, etc. Speak with the company who produced the rounds to determine best course of action...not the best and fastest resolution in most...