Winchester 209 primers are NOT hot enough. You need either CCI 209M or Federal 209A primers. Also make sure you seat the bullet real good.
I had my CVA plug modified and that helped tremendously!
PS. I still didn't get my range time yet, and I'm trying to find a better way to get a really good measurement on my barrels. The caliper won't reach the inside on the landings because both barrels are hollowed out for easy load. I'm going to have to figure out something like use a divider then measure that?
