steamingutpile
I kinda always hate to get into these "crud ring" discussion becauseI really do not have that problm in any of the guns that I shoot. I only use T7 powder and an completly happy with it's performance. Once in awhile I might bet the hint of the ring but it is not a problem for me becasue I am one that swabs the barrel after each shot, whether I am shooting conicals or sabots. I could/can load up to five sabots easily one after the other if I need to. But I have a theory... I am one of those people that shoots a semi fouled barrel and I also leave loads in for weeks at a time. I also spend a lot of time shooting and I always shoot on this "semi-clean" barrel. So I run a regular windex (windex with ammonia) patch after each shot- in that way each shot i takethe barrel is inthe same condition giving me the same POI. For me running a patch is not a problem it is just part of the routine.
Really do not know if any of this helps becuase ifyou get the "crud ring" you probably will continue to get it and I really have no idea why i do not get the "ring" to the extent that others do...