If my line of thinking is correct, data for 2-3/4" hulls and 1 ounce of shot should be fine insofar as powder type and charge. Theoretically, you would, or may have to shorten the one piece wad to allow crimping, which might reduce your payload. There are specific tables out there for short shells, probably due to the wad issues after trimming your hulls. I have the info for my short tens, but nothing for short 12s. Search the forum. There quite a few good threads on loading the short 12. I don't want to confound you with what I DON'T know!
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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