I had an interesting phenomenon occur on our trail yesterday. I took a newbie out for his first experience with muzzle loading rifles. I gave him my Chambers Virginia .50 cal rifle to shoot. this rifle has a wonderful bore...slick as can be, and has always been a winner for me. He and I were both shooting .50 cal rifles, with the same ball (.495" pure lead) same patch and lube (.017" denim with LehighValley Lube) with saturated wet patches. About twenty or so shots into the trail my apprentice said, " I can't believe how easily these load. The guys on U tube have all kinds of trouble, have to clean continuously, and have a heck of a time getting their ramrods to push the ball down." I took his rifle and loaded it - he had done all the loading with his rifle to this point. About 14" down the bore, I came to a tight CRUD RING. I forced the ball through it, only to come to another one about 6" further down. I fired it off, and then handed him the rifle to load. He poured in the powder, took a pre-cut circular patch from the tin, with his thumb and forefinger, but he was wearing cotton gloves. He was effectively removing almost all of the lube from the patches with his gloved fingers. Damp patches don't get ALL of the fouling, even with a fairly tight combination like this. I took one of his patches and loaded it with spit...LVL tastes aweful - and again loaded his rifle, and that removed the crud. We finished the trail without incident, once I gave him a little more advice on handling the patches.
The lesson learned was this: we could have used saliva for lube - it was only -6C...just a bit below freezing, and cut the patch on the muzzle, and that would have avoided the problem.
Anyway, that was my first and only experience with CRUD RING.