Muley's right. I never noticed much of a problem with leading in the ML's I shoot conicals through. I use an overpowder wad and that may help. I don't skimp on the lube either. After a thourough soap and water cleaning and drying, I sometimes saturate a patch with a good quality solvent like Butch's or some Kroil and let it stand for a day or so then go back and swab again to remove any possible leading. If you're still seeing some leading then use a bronze brush and solvent like Cayugad suggests.

BPS