All rifles are different. But my two Great Plains Rifles like a little more powder. The Great Plains Hunter I have is a .50 caliber and likes 95 grains of Goex 2f and a .018 patches ball. The Great Plains Hunter I have likes 70 grains of Goex 2f and the same patched ball. But one has a much more roundball twist to it.

I think your on the right path with your shooting. Hang in there. Its looking real good.