I shoot that bullet 500gr LEE all the time, had a BC but also have a M1867 Remington RB, and a Shiloh long range express so I sold the BC, not because it shot worse but because I could get my money out of it and be hard pressed to get what I think the 1874 Shiloh is worth. The 500gr bullet shot very good out of the BC not a lot of difference in POA from the Shiloh, but you can shoot the Shiloh a lot longer as it weighs around 12# and the BC 7-8# hard on old men. I will not tell you the load but I use surplus powder 50BMG pull down powder with the same results as black powder but not quite as dirty. Right at 1200fps from the BC. .