What Jeff sez in his post #5. I have been loading a super heavy crow load for some time now using once fired "AA" hulls. In it goes a healthy dose of 540 and 1.5ozs of #8 shot.
I had so many (free) hulls that I did not bother to load them twice. Still have about 800.
I have a buddy that I gave about 1000 hulls to some years ago that still loades them for ducks and geese in Maine. HEAVY LOADS !! --- SAWMAN