Thanks for the explanation, I was thinking that the larger bullets would leave more lead because the rifling would take a bigger bite out of them, but it makes sense that undersized bullets might "skid" across the rifling a bit and cause heavier leading as the bounce down the bore. I will try to get the .358 sizer. My uncle said that he used a .358 mold so the bullets shouldn't be undersized at all, but I will check them with my digital caliper when I get them.

"So what Jefferson was saying was 'Hey! You know, we left this England place because it was bogus. So if we don't get some cool rules ourselves, pronto, we'll just be bogus too." - Jeff Spicoli