Okay, straight up facts first.
Cast boolit: Lyman#429421
Alloy: Wheel Weights - straight.
Weight: 256.0 grains 'average'.
Sized to: .430
Lube: Felix Lube
Firearm: Smith & Wesson Model 29
Barrel Length: 4"
Brass: Winchester Western
I started with a clean barrel, ran one wet patch of Hoppes #9 through the bore followed by a dry. Then I started testing my loads. I would check after each group. I'm not totally sure at what point the leading began. The lead was in the first inch/inch and half of the barrel. It brushed out easily enough. Then I began testing with the same components, except with full house loads. Alliant 2400 at 20.0 to 21.0 grains. Then about another 35 -40 rounds of full house loads of H110. No leading.
What gives? Am I not kicking the bullet hard enough to get good obturation with a too light charge of Unigue?
Any other 'medium' loads anyone can suggest? Or is there something I can do about my current choice of working between 9.0-10.0 grains of Unique? I'm looking for a good practice load.