I bought this Isaac Hollis 8 Bore Big game rifle - no clue what to load

Hello All,

I bought this 8 Bore Big game rifle at the last Poulin Auction but I have no clue what to load for it.

Bore measures .850" and I bought some .830" round balls. Now I need to find out how much powder to use and patch thickness.

any suggestions?

http://www.buckstix.com/buckpics/8bore-000.jpg