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this may...or may not be relevant but will type it anyway.
way back when I first got my vastava mini mauser 223 I had issues with the odd misfire...put it down to hard primers on norinco ammo...

at least you didnt harm yourself or the rifle.....
if you want to look at worst case from here...you pull em all...pour powder into garden and start again....or you keep powder and devide it up by...