Bill,
According to an older Alliant reloading manual a 3 1/4 dram load for a federal hull in 12 ga. lists about 9000 psi using 22 gr. of Green Dot over a federal primer with an rxp 12 wad and 1 1/4 oz. of shot. I tried using 24 gr. of Green Dot over a federal primer with a rem. sp10 wad in a federal 10 ga. hull with a 1 1/4 oz. of #8 shot.
This is the load that seems to allow some gas seepage. I have also used Red Dot in my 10 ga. with good results, but my Red Dot supply is gone so I am hoping to find a satisfactory Green Dot load.
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