I was out on a range session yesterday and had one stuck case out of about 50 plus rounds. It was after the first 12-15 shots. I was using a stout load of 23.8 grains of h110. I pushed my bolt back pretty hard to get the casing out. I noticed some scratches along the case. I immediately thought it was a hot load but after inspection the primer looked normal and not flattened. I inspected the firearm for damage and found none. The rifle was a Ruger 77/44. I shot the rifle a good 25 times after the stuck case without any issues and it fed fine with the same load and same brand casings. After my range session I noticed a few lead rings that were inside my fired casings. Little thin lead circles that mush have shaved off the boolits as they entered the rifling. They looked exactly like what was left after sizing slugs through my bore. I'm thinking a lead shaving got caught between my case and the chamber and jammed it up. After my shooting session I checked and had no leading in my bore. I'm using 270 grain devistators and sized them one one thousands over my bore diameter through my lee sizer. I PC and GC them at the same time. Is it normal to have a lead ring shaved off my boolits or am I doing something wrong? This the first I have noticed this happened and I've put a good three to four hundred rounds through the rifle. I plan on cleaning and polishing the chamber out with a soft copper brush today in just in case there might be burrs and or lead fowling. I was using 50/50...half acccow and half pure...lead flooring along with 2% pewter. Could a boolit have started in my rifling a little crooked, or sprung back from sizing? Grouping was OK. My best group with this load was 2.7" at a 100 yards.