bojac wrote:Isn't there a ridge inside toward the base of the hull that hangs up wads?
Some do and some don't, your Federal lead wads are wider at the base than Remington or Winchester wads so there can be some problem with them.
Main problem it seems these hulls were set up for very fine ball powders and Winchester wads, basically the wads are supposed to seat and seal inside the inner support wall of the hull. From my measurements it seems you can only use a limited amount of ball powder and the AA12 wad to get the exact factory type fit. Once you go to flake type powders or bulkier single base types like the IMR powders, all bets are off, a lot of times the powder charge goes above the rim line of the inner hull wall, you go to final crimp the load and all kinds of weird thing seem to happen sometimes.
I usually do a test load or two with a recipe I think is going to fit and see if it actually does.
For hunting loads with increased powder or shot charges the AA12R wads are short enough to accommodate loads calling for longer wads like the AA12.