I have some data that I got from the singleshot pistol forum but it is for pistols.
I shoot 33 grs IMR 4198 with 125 ballistic tips in my 14" Shilen SS MGM Contender pistol barrel. I get 2670 fps average and under MOA accuracy. It hammers deer. The data that I have list 34 grs IMR 4198 as the max but it was too hot in my barrel.
This data has a load given as 38 grs IMR 3031 With 125 BT at 2480 fps our of a 14" barrel.
Like has been said this is a wild cat and you are pretty much on your own. Start with 30-30 Win close to the top loads and work up SLOWLY and you really need a chrno to tell you when you should slow down on the powder. Even though you might not have pressure signs on your case if you are getting much more than around 300 fps over what a 30-30 Win will get you with the same bullet you are getting up there on the pressure and it is time to stop.