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Some of the Pedersoli trapdoors have been known to blow the action open when fired. I'd try a mild smokeless load to see if that is going to happen. If it does, send the gun back and have it fixed.
For a blackpowder load just be sure that the case if full. If the load you have kicks too much reduce the powder charge and fill the remaining space with something like oatmeal. You can drop the charge in this manner until the recoil is no longer a problem.
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