I have a CVA in-line muzzleloader. My primer keeps falling out. I'm afraid that when I'm out in the field in a month that's going to happen when I'm looking down the barrel at a deer. Shouldn't it wedge itself in there?
You do not state which manufacturer of primer you have, could be just a cheap knock off of the 209 primer or a worn part on a well used gun. Just a dot of nail polish on the primer may get you by until you get it corrected.