I had one, up until a short while ago and had a lot of fun with moderate power cast loads. Something that helped me quite a bit and may be of value to you is Ken Waters book / manual Pet Loads. Mine is a second edition however, I believe a newer edition is currently available. Most of the manual is info compiled from the Handloader magazine. For the .45-70 he goes into some depth on the three relative action strengths and loads for each group, cast & jacketed. As I understand it, the Pedersoli is on a par with the Navy Arms roller, which Waters classifies as a Group II moderately strong action. Another good source of info is the Lyman Cast Bullet Handbook, third edition. Similar to the Pet Loads by Waters, they also list loads for three separate action strengths. Both of these publications would be a real benefit to you, but f you're really stuck, PM me your e-mail address, the specifics of bullets you plan to use ad I'll see if I can scan & send some info.