You are so lucky to have 4759.I'm working on a mild load for the trapdoor. 10.5 grains of Trailboss and Norm Purcella's 350 grain coated gas check bullet is very mild and accurate. It hits dead on at 100 yards. I need to check the velocity and try to duplicate it with SR4759.
Everyone online talks about how amazing it was, specially for 45/70. But I guess now it is discontinued.