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YES, You can SHOOT SMOKELESS ammo. Pressures in commercial smokeless .45-70 ammunition were deliberately kept on the moderate side because it was expected that people would be using it in trapdoors. It is perfectly fine. Just don't shoot overpressure stuff like Buffalo Bore. I hope this helps

Shawn, for safety and warranty reasons, I would seek the advice of the manufacturer (Cimarron Customer Service) at (830) 997-9090 or 1877-749-4861. Cheers and stay safe!