Had a local 'smith install / chamber a Douglass # 4 on a post 64 Win 70 SA . Have put about 300 rounds of jacketed thru her & it's still a pretty heavy fouler . Like 20 rounds of jacketed & 3 hours to get to bare steel again . I eventually want to shoot cast but wondering what to do to smooth out the bore some more . It's a XX grade should I hand lap , fire lap or put some more jacketed thru her ? FWIW I don't feel any tight spots when cleaning .