When I was trying to load the 12ga brass I used 10ga OP cards, 11ga cushion, and 10ga OS cards. I used a Mec Jr because the wads were so oversized and I wanted a really tight fit from my muzzle loading days. Worked great with BP, but when I went to PB even at 30grs I got bloopers. I was afraid to go with more powder [ I have blown up a gun loading PB when I thought it was Pyrodex ]. Anyways, I'm glad to hear you found a load. You may want to try 8ga OP cards for a tighter fit - possibly with less powder. In plastic shells the crimp has a lot to do with creating pressure and I believe the tighter the wads in a brass shell you'll have better combustion and pressure because the final crimp with brass is just the OS card glued in - not a lot of resistance like a roll or star crimp. Good luck.
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Paul Harm
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