I am sure what you have there, something will work. Try 100 grains of Pyrodex RS and some of them 200 grain Shockwaves. Or 100 grains of powder (you pick the brand) and some of the 300 grain XTPs. I like the .430 diameter 44 caliber in green Harvester Crushed Rib sabots. All you can do is try some different loads at this point.