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With all respect to Ken Waters, we've found that the current Handi rifles are capable of handling pressures far above the old Trapdoor loads.
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Then you had best read the OP's post more carefully:
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...i had an old h&r 45 70 laying around...
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Unless you are prescient you have no idea of the metallurgy of the OP's frame. Do you know when it was made? "Marlin level" loads could cause severe damage to a 1970s-vintage frame, or to a current "shotgun" frame (which are not recommended for high pressure loads either).
If the OP's frame is a rifle frame of recent manufacture then it is most likely safe with "Marlin level" loads. I own a H&R Shikari in .45-70 purchased new in 1973, and there is
no way I'd ever fire 40,000 cup level loads in its cast iron frame.
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