You can go to rstshells.com and select the lightest loads in smokeless powder and they would be as unlikely to blow your gun up as black powder loads. Prior to using either, you should measure the barrel wall thickness and make sure it doesn't deviate much from factory original. Most sellers of black powder loads don't test them for pressure or at least they don't say so. RST does test for pressure and it is very low in their lightest loads. They will tell you what the pressure is on specific loads if you call them.
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