Take a look at some load data and recipes from the powder manufacturer that you like to use. Any load that is under 8,000 psi should be just fine for your gun. I use this number because i believe that RST makes no loads that are higher than that.
I load 1oz shells that are around 7,200 psi in both 2-3/4" and 2.5" and they perform well and i put them through any of my guns, damascus or fluid steel.
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B. Dudley
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