The 777 crud ring seems to be more consistent with heavier bullets or at least that is what I am getting from the reports. People that shoot 250gr. bullets or lighter seem to not have the problem or only experience a little. I shoot 300gr. and heavier bullets and I get a lot of it. It forms a very hard ring just forward of the powder charge and seating a second bullet without removing the ring becomes impossible. It may also have a lot to do with the barrel and/or breechplug design. Flat faced breechplugs seem to be worse than recessed face plugs. My gun is a T/C Omega and it makes the ring with 300gr. bullets and 209 primers. It makes considerably less with rifle primers in the .25ACP conversion. I also have a Traditions Pursuit LT which has similar results. If you shoot lighter bullets and use standard primers not the 209 you may not experience the problem. If you shoot heavy bullets use 209 primers and do not have the problem; CONGRADULATIONS!!!! I hope this helps to explain the reference. It is a big enough problem for me that I am looking at alternative powder (Black Mag3) which does not produce the same fouling problems.