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you learned a lesson I will never forget....at least you escaped mostly unscathed mate.

did you perhaps also get told not to use powder you cannot 10000% verfiy is what you are told it is ? :yaeh am not durnk: .......too soon ? :P

I find velocity a pretty good indicator, but usually I will look at a culmination of things and then the velocity kinda just confirms it.
primer flattening, ejector stamp and or swipe, heavy bolt,...