I started putting in the lead remover last night, and just went through my stuff and found a very warn .22 brass brush, that I kept just to clean small parts by hand. Threaded that on, and with a few tries, it does go through all the way. Now that the barrel is fairly clean, I can see in the barrel a small area that isn't as shinny, so I'm guessing that is the lead build up. I'll keep adding some lead remover.. and running that brush through, and graduate to a new brush