Carl, if my memory serves me correctly, most of the factory loaded ammo is loaded to the low pressures needed for the older guns. The high power stuff is noted as such and marked "Not for black powder firearms" or something similar.
I had a Trapdoor but loaded only black powder rounds. You will end up buying a set of dies and several bullet moulds as those guns are an absolute treat to shoot. Accurate Arms 5744 is a good powder to load and their is a ton of reloading info available for the 45-70.
And it will become one of your favorite guns! But you have to try black powder and get back to that guns roots!
"What, me worry?"
"If I were two faced would I be wearing this one?" - Abe Lincoln
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