I think IMR is now owned by Hodgdons. If you stop and think for a moment, a 10ga chamber is larger than a 12ga, so any moderate 12ga load will be even less in a 10ga - more surface for the powder to expand against. I believe all 10ga shells are straight walled and I treat them all the same for reloading data. The 7625 Craig is using is no longer made or PB and 4756 - all gone. I use the 16ga 1/2" cushion wads in a SP-10 to take up space - they're easy to cut the correct height for a proper load height for a good crimp. One 1/2 wad is cheaper than two or three .125 over powder wads. Of course a navy bean would also work. I shoot 1oz loads in my 10s for clay birds. I don't remember right now, but it was 21.5 or 23.5grs of GD and 1oz of shot. I'm thinking it was the 23.5 load - no recoil and great at breaking birds. Good luck.
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Paul Harm
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