Finally shot my first bullets I cast myself and experienced some leading. I know, shocking right? Load was a .38 case, a lee 158 swc tumble lube, and 3.4 grains of 700x. They were tumble lubed with straight liquid alox. I experienced fairly light leading mostly in only the first couple inches of barrel. The bullets were .358-.359. By taking the back end of my calipers to the cylinder throats I was getting .3565-.357. I believe this is my problem. That was in my gp100. There was also a little bit of leading throughout the rest of the barrel (very minor) so I think next time I will try using more lube. My question is, should I plan on reaming the cylinder throats? If I do ream the cylinder throats, will my performance with jacketed go down? Thoughts?