the 375 hellfire shooting ceb lazers 350 grain 3500 , 400 grain 3250 and the 425 3100 the 416 hf 525 lazers 2950 plus 458 hf 600 grain 2980 great brass we start with 375 brass and neck up
we use a 30-378 sizing die to neck the 33xc brass down to 30xc being careful to keep from going to deep then you need a proper sized bushing to bump the shoulder down with the 33xc die
what we found out about this powder is using a cooler primer and 869 gave us over 120 ft /sec vel increase the longer barrel would in my opinion work great running a 7 twist so solids are all we can shoot
how did the 7mmXC work ? we ended up on the 30xc using cold 869 with a cci 250 primer 212barnes @ 3680 230 lazers 3520 239 flatline @3460 the key was switching to the cci 250s from 215 match and keeping the rounds cool may help on the 7xc