I don't have that particular barrel, but I do have a .54 CVA Hawken; I load it with PRB and 90 grains FFg, using a .530 ball that I cast myself and a .010 patch.
As far as diamter of ball and thickness of patch, a lot of that will be determined by your rifles groove thickness and diameter. As for one turn in 70" vs one in 66, I really don't think that there will be much of a difference......I'm willing to be they will both be good ball shooters.
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