Im far from an expert, but I've done a lot of reading.... Two possiblities that I have read about, Low pressure loads, or too hard brass.... If its the same brass on both loads, I would suspect the first one.... annealing the case necks would be the solution there... Personaly though, i would shoot them a second time now that they are fireformed and see what happens....
Again, I have no personal experience here, just what I have read.....
Bookmarks