If I remember correctly, the one that was meant to be reloadable with BP was the .32 Winchester Special.
Rather than looking for loading tables, I'd suggest taking a look on BP reloading in rifles. I have a book like that around here. It goes into paper patches and all that fun stuff that you probably won't want, at least at first. But it might have some good info for you.
If I remember correctly (big if) it's not a matter of loading a certain powder charge. It's a matter of filling the case, as with handgun cartridge loading.