Do you have a chronograph? Might want to see if there is marked differences in velocity.
Darren Newsom, ACI, knows how to make ammo. I've shoot thousands of his rounds and probably watched over a million being shot by our students. I doubt it is the ammo, but give ACI a call (406) 777-1222. The reality is that no manufacturer is perfect. I'm sure he'll make it right if there is a problem.