I dont have a lot of experience with smaller cast , 32SW is the smallestThanks mac. I tried Trailboss and though the velocity was what I was after, accuracy wasn't great. I have that article on cast bullets in the .25/20. It's a pleasant little round and I'll keep at it.
Im going to guess a balance between lighter bullets and powder charges.
Plus finding a powder that fills the case the most near your velocity?
Un related but I get some pretty good results shooting as heavy bullet as I can as slow as powder charges data shows have given very good accuracy out to 100 yards