RE: THOMPSON CENTER PRO HUNTER
I have had the same problem. The triple 7 primers are about .003 - .004 longer than the other primers. I like the fact that they fit so tight there is no blow back. you won't like this but, I put my plug in a vice, eye 7 ear protection and placed each primer in the plug and LIGHTLY tapped it with a flat faced hammer. It reduces the length of the primer and they work fine. No nothing went off!!!