How hard was the alloy out of the blackout and how hard were you pushing them? Gas checks? I found out with Hi Tek in my 308 that you can't do anything that violates the physics of loading. Put some 11 or 12 BHN (forgot which) through it with no gas check near max load of H4895 and got lead in about the last inch of the barrel. What I'm saying is Hi Tek will not let you put pressure on softer bullets that they will not normally take. Probably could have shot the bullets with reduced loads. Never tried.