Start with a .435 round ball, and .010 to 015 patching, lubed, of course, in front of 20 grains of FFFg for a start. YOu can take that up to 40 grains, but the recoil becomes noticable and there is very little reason to use such a load, unless you enjoy seeing lots of muzzle flash. I think you will enjoy shooting the pistol with loads between 20 and 30 grains.