I just finished the process with my new 257. Barrel is a 22" 3 groove Lilja. I run a drypatch thru the new barrel too remove all oil. Fire first shot. Soak patch with Sweets 7.62 Solvent and run thru barrel several times. Follow with clean patch till dry. Follow this procedure for first 20 shots between EACH shot. I use these to get scope in vicinity of correct point. Then I shoot for groups. There is a well known maker in the area who does the same thing but also uses a brush each time. I don't use a brush at all and the Smith who built this rifle does the same as I do. I was shooting 3 shot groups when I broke in this barrel and the best group was .283. Good enough for practice.