What I found in my Marlin 1894, my Martini & my Ruger #1, is that the heavier the bullet, the better the accuracy, in both jacketed & cast.
In jacketed, everything below 158 gr SUCKED, and 180 grain bullets (R-P Hornady, Speer, & Frontier) worked best. In cast, as the weight went up, there was a substantial inversely proportional reduction in group size.
H110, W296 & Lil Gun; it didn't matter, although usually 1 bullet preferred one of the 3 over the others. I also tried W680, 2400 & a couple other powders, but they performed nowhere near as well; not to mention they were a fair bit slower.
My $0.02 Cdn.