Inherented my Dad's ML 10 and really want to hunt with it this year. However I keep getting spradic igniton with sometimes the charge not even going off. The primer will just snap sometimes. I have bought new Federal primers, used different powder, and yesterday I installed new breech and new vent liner. After this last fruitless trip to the range, I removed the new breech and tried to see if a primer would slide in it. They will not or at the least, they just barely go in. Are the primers suppose to go inside of the breech and how far. Could I have oversized primers?? Any help is appreciated. I am about ready to give it up. Thanks.