I have used 17.5gr 300MP/CCI 500 primers in all of my 357 pistols and rifles for the last six years with a NOE 182FPGC. Ejection from two model 27's and rifles are easy. The 101's I get a black residue on the outside of the virgin Starline brass. I've honed the cylinders, 300 grit and 600 grit, cleaned the loaded cartridges with alcohol and the cylinders, dropped powder charges of 300MP to 16grains all to no avail, I still get what appears to be blow back around the case.
With 38 Special wadcutters I get lead spitting in all five 101's that tie up cylinders in 15-20 rounds. Has anyone run into this and found the fix? The boolits are 22 bhn lubed with LBT blue lube.
Just some thoughts/questions, are the thinner walls on the 101 expanding to much with the brass and the brass doesn't have a chance to shrink back down when pressure drops?
Can the forcing cones take a slight chamfer and polish to reduce lead build up on them?