Tried an experiment....took a Lee .38 Cal 158 SWC-TL and a .44 Cal 240 SWC-TL and lubed with liquid alox...loaded both to 1,000 FPS and carefully checked the barrels before and after in the .357 & .44 Magnum pistols. Both had more "gunk" in them than I would like. Using a LLR I cleaned them and allowed the debris to fall on Dark paper and found bits of lead. Both shot quite accurately and the gunk builds up to a point and remains about the same. Bullets were unsized and cast out at .360" & .4315"--the pistols used have groove diameters of .358 & .430" respectively. I then shot another batch with Outers Foul Out cleaned barrels===but this time I did a second coat using auto car wax on the TL bullets. The difference in barrel fouling was remarkable...much less and similar to what they'd look like using a regular cast lubed & sized bullet. The only difference is the scent of Auto wax when fired.