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Hey, just now saw this. I haven't logged on in months. I'm using a Hornady die set and while I haven't had any problems with my ARP barrel, I do know that some around that time frame were short chambered. The only time I've read about belted Grendel magnum cases was when people were using 24" barrels with incorrect gas port location or size. I think LRRP1955 or whatever his name is had that issue. You might check with him. Sorry for the delayed response