You may blow holes in your patterns because you'll need more filler wads than would be used with BP. Other than that, I'm at 24grs of 7625, a Rem SP-10 plastic wad with a 1/4" 16ga OP wad inside it with 1 1/8oz of shot. You're going to get less pressure with paper wads. I had talked with Graig from Circlefly who shoots and had tested a load of 30grs of 7625 and 1 3/16oz of shot in 2 7/8 chambers. In my short chambers - 2 5/8 - it kicked like hell. So I loaded up 1 1/8oz and shells with 20, 22, 24, 26, and 28grs. At 24 and under recoil was acceptable [ to me ]. Barrels were a little dirty so I'm not sure how complete a powder burn I got [ having not previously used 7625 ]. To me, short shells seem more prone to an increase in recoil - had the same problem with 2" 12ga. So, you'll just have to load some and send em off for testing. I didn't because I feel mine are ok with a lesser load than what Graig had tested. Good luck.
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Paul Harm
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