Im fighting a leading problem and am baffled and may switch powders. Im using an alloy of ~70% clip on wheel weights and about 30% pure(ish) lead. This week I casted up 200 158gr lswc. 100 of which I let air cool(softer) and 100 quenched in water(harder). I then took 50 of each set and sized them down from .360 to .358. so essentially i had 50 of each quenched sized, quenched unsized, air cooled sized, air cooled unsized and for each of the four groups, I loaded up 16-17 of each 3.4, 3.7 and 4.0gr of HP-38. The 4.0gr loads across the board leaded the bore fast. The other loads were pretty good to the bore but during this experiment, the one thing I noticed is that the bullets sized down were significantly more accurate than the unsized bullets.
Im still frustrated by this leading problem which seems to have happened all the sudden with my standard go to load (3.4gr hp83 with a quenched and sized boolit). another issue I was trying to fix has not been resolved, even with a load over the "max" listed in the lee book- Im still getting soot along the casings leaving perfect "shadows" of the casings back along the breech face.
My leading problem is causing me to loose sleep... all the sudden, the last two batches of the 3,000 some rounds of my go to load are slicking the bore in PB... cylinder lockup is still tight and gap still at about .005"
Should I add- If any leading doctor is reading this, I believe my situation is unique as im seeing shiny lead spattered over the leading edge of the forcing cone which meets up with the cylinder face.