Mike, I find your results interesting. There is an individual on the Marlin Forum that tested his 44-40 with BP. He had read that Winchester claimed the original 44-40's could be shot accurately 30 times without cleaning. His load was Swiss 2f but 3f would burn cleaner also. I have been getting the bug to get a 73 Clone in 44-40 and have thought about BP loads for the rifle. I already have the Lyman 44 mold that was intended for the caliber and various sizing dies. I had one once in a pistol. Those older rifles intrigue me. The 44-40 was more popular than it should have been.
DEP