Like all blackpowder I have to start with the smallest charge size recommended, for the patch/conical/round ball I am using and do at least a minimum of 8 shots per increasing the powder increments by 5 grains until I reach my desired results. Barrels, rifling, powder charge, patch size it all increases or decreases accuracy as well as velocities. I got a Hawken that loves 85 grains a .490 round ball and .12 ticking and another by the same maker few years apart and abused by previous owner that thrives on 70 grains a .495 round ball and .10 ticking to get my desired results out to 100 yards. Do I dare to say you should play with it, stroke it find the diet the rifle enjoys to bring you to your desired climax? hahahahahahahahahah. Good start for a .50 cal 50 grains, .490 round ball and .10 patch keep an eye on printing, what is happening to patches burnt, shredded, char, holes worn it all tells one needs a thicker or thinner patch or larger ball.