Remember this will be an explosion about 4 inches away from your face. It's a 300WM too, so although the brass may work... do you really want to risk a possible case head separation or another type of case failure due to possibly damaged brass. I would probably set those cases aside, maybe make some dummy rounds out of them or something. Odds are if you have a gut feeling making you uncomfortable with them, then it's probably wise to follow.
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