So made it to the range today with several loads from 40.0 - 42.0 and the CCI450 small rifle magnum primers. No pierced primers and shot the best group yet with the 42grn load. Shot the first three out of five then a cease fire was called on the range so some guys could go get their targets then I was able to finish the five round group. I'll shoot it again where I can get all five on the same string. Thank you everyone for the input on this!