First, relax. You cannot overload a modern replica bp percussion steel frame revolver. It will be safe to shoot no matter what load you put in it, as long as it's not smokeless powder.
Pyrodex and real black powder are equivalent when measured by volume. Pyrodex is, however, less dense than real black powder, so when measured by weight it should be reduced by about 10 to 15%. If you use the same weight it will still be safe to shoot, but your results in terms of accuracy may be affected slightly.
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