@jonboatjockey
Couple things could be going on for sure. First a few questions:
Have you chronographed this load? What's your barrel length and speed?
As alluded to above, does the serial number of your action start with "RR"? If so, they need a new bolt handle TIG'd on to bring back your primary extraction. Even if it's not an "RR" action, if your action was blueprinted the smith likely turned back the action lugs thus pushing your bolt farther rearward and reduces your primary extraction. Definitely an issue and why every action that gets blueprinted here gets a new handle. I've seen guys TIG a small bead onto the front of the bolt handle cam area to contact the receiver camp to help with primary extraction as well, but I don't do that.
I recently did a 28 Nosler rebarrel for a customer who did not want to spend the money on a blueprint job for his R700. His action had adequate primary extraction however his factory extractor was ripping the case rim off the brass. The factory extractor was only getting maybe 20% engagement of the case rim and it would rip it off. I installed a Sako extractor on his bolt and his issues 100% went away.
In summary, could be you've got too hot of a load and need to back off... Or your factory extractor is not engaging properly and is ripping case rims off (almost a given in this situation if you're load isn't too hot), and/or your action doesn't have enough primary extraction.
What does virgin brass look like after firing in your chamber? Does it come out with a smooth surface finish or does it come out with chamber reamer hash marks in it? Too many builders out there leave their chamber surface finish too rough and it doesn't help certain chamberings. Best of luck!
Mike