The steel ammo, specifically Tula, has much faster burning powder than can result in short stroking if the gas port is too small.
Bottom line, there isn't enough data here to solve this. The failure to BHO could have just been a light round combing with a slightly under gassed system and a weak mag spring pushing on a worn preban follower. Too many variables.
Bottom line, there isn't enough data here to solve this. The failure to BHO could have just been a light round combing with a slightly under gassed system and a weak mag spring pushing on a worn preban follower. Too many variables.