My first guess is you are trying to put 6 pounds in a five pound sack. The first thing I would try is a shorter wad. Second would be more wad seating pressure to collapse the wad more. If the shot column is under high pressure in the final crimp, the friction forces the shell tube to buckle. Ron
I'm having a bitch of a time with my RCBS Grand and older 20g HS AA hulls. I push the wad in as deap and hard as I can (using AA clones wads). It helps some. Ugly crimp but they shoot. The best so far is I've backed off a 1/2 grain of powder. That seems to have helped the most. I reloaded two new boxes of HS AA hulls that I bought and shot. They crimp almost as good as the factory crimp. If all the new HS AA load as well as these two new boxes and clone wads I'm using all will be well.
Had the same problem with my 20ga. Grand. I started using Rem RXP20 wads and had more success. Kent Sakamoto at RCBS explained that one of the problems with loading 20ga. on the Grand is the inconsistancy of case lengths. Bill
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