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That load is a duplicate of black-powder ballistics, as far as velocity, I have shot *many* such rounds in both black powder and smokeless, in a wide variety of 45-70 rifles over the last 50 years.
Don't worry about leading, the tendancy toward leading at that velocity is more a function of your bore smoothness ( which is built in by the factory) and the lubricant used on the bullets, which you can only control when *you* make the ammunition.
When you buy your rifle, buy one of those good quality one piece rifle cleaning rods, a really sturdy one like the Dewey brand.
Also look around for one of those lead removers as sold by Hoppes. The ones that use a special ramrod tip and a disc of brass screen such as used by bullseye revolver shooters.
They are made for specific calibers, so get one for the 45 caliber, that gizmo and a really stout cleaning rod will remove all traces of lead from a rifle bore quite easily.
Jim
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Lay up some blackpowder and flints
The rest we can build, if need be
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