Re: Powder charge
Also give a good cleaning between each group.
With shooting black powder I have found consistency is the key. Load the same way everytime, every step. Accuracy will differ with every rifle. You have so many variables. caliber, barrel length, powder type, powder charge, patch thickness, lube? Even the thickness of the front sight blade. It can get mind boggling. For just a hunting load then start at the caliber/grains and work up. I have no experiance in .45cal. The closest I've had is .50cal. I've found the short barrel ones to like a load around 60gr. Long barrels(40"+) I have found them to like a load around 90gr. This is with 3F Goex.
Best way to find out is to spend a day on the range with your rifle in the summer. Trying to find a good load last minute can be a pain. But I bet it will be 55-70gr 3F goex for most accurate load.