Frank, you'll probably have to find a friend to load them for you, or learn to reload yourself. If you were shooting a double gun you could buy RMC (Rocky Mountain Cartridge) brass and load your own with no significant tooling. But this probably isn't recommended for the lever action, because of the sharp front lip on these casings.
For your gun you probably want crimped shells, with a rounded forward lip that will be more friendly to the feed ramp. Buffalo Arms claims that they may be able to load any ammunition you want, if you don't see it on their site (at a price, no doubt).
Another option would be RST "reduced recoil" shotshells, but I don't believe they make them in 2 1/2" for 10 ga. (others, please correct me on this). They do offer 2 7/8". These are not black powder, but lighter loads of modern powders.
If you can find a way to get access to low-pressure smokeless loads, it will probably be a lot easier on your gun in terms of filth and corrosion. The nice thing about double guns is that they break down into simple parts, and most of the grunge is in the barrels. Black powder is extremely dirty, and gets into the guts of more modern pump/lever/etc. guns.
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