Couple months ago I started using cast bullets(45acp 200gr swc) and shot probably about 30-40 rounds of it with little lead build up right where the rifling starts. Yesterday, I shot about 50-60rnds, and there was a lot of lead build up in the chamber. Is that normal? I'm loading 4.6gr of titegroup. Also what's the easiest way of removing lead in the barrel? Using a bronze brush with clp takes forever, and by the time I'm done, the brush is kinda loose in the barrel.