Ok so I built a gas piston upper with an Osprey conversion on a 16" bbl and a mid length gas system, it has 60 rounds of commercial ammo cycled through it for function testing and break in. I tried my reloads in it which are new remington and winchester brass, cci primers, 26gr of Varget, and 55gr bullets not crimped just pressed in with the die. Now the commercial rounds no pierced primers, my reloads all 12 pierced the primers. Too hot one would say, but I checked the reloads in a rifle length GI system and no pierced primers and no signs of too much pressure. All tests made were with the same lower with a RR 2 stage trigger. I'm lost any ideas would be helpful. Thanks