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i used pistol powder/cream of wheat method with annealed cases on the first firing . . . i didnt want 100 medium pressure reloads o have to get thru before i went to the top end of performance

if...

its good you see it being a AI as a positive . . . funny you only found out when you pulled the trigger, a WTF mooment if ever there was.
the gunsmith should have so marked the barrel . . but not...