I've personally experienced this in my 300 PRC and ADG brass. I started with a whidden full length bushing die... first load just expanded the necks and loaded, then full length sized after the first firing. No problems on first or second firing. Third loading same deal FL size expand for neck tension, loaded rounds chamber fine, shoot fine but stick in the chamber, like completely stuck, can't be removed with the bold. I had to knock them out with a cleaning rod. Measure brass and they are a couple thousand bigger at the web than sammi says they should be (can't remember the exact numbers) I can look them up if need be. Phone whidden they blame ADG brass for being too tough. Say they will make me a custom die if I send 3 pieces of brass in.... that was March, still no die. In the interim I ordered a Redding standard FL die and ran the rest of that twice fired brass through that die and they chamber, fire and eject no problem. I haven't reloaded that batch of brass again but it will be interesting to see if the Redding die will keep them in spec. I've heard, and this is just speculation so take with a grain of salt, that other people have had similar issues with whidden dies in other calibers not sizing the web area down enough. A couple of these guys felt the problem was the use of aluminum in the die which gave or flexed allowing the brass to remain too large. I don't know about that but I can tell you my Redding die fixed my issue for now. I've really only heard of this issue with whidden dies and ADG brass. There's a bunch of 300 PRCs out there and lots of people shooting ADG brass in them but I've only heard of this coming from a few guys, really makes me wonder what the issue truly is, dies, brass or chamber.