I think they guarantee 1 moa or better for all their rifles, they sent the proof target with it and it looks to be 0.750 group with BHM ammo.Yes I actually use a Otis wire with brush, and cotton swab to do the break in 1 round 5 rounds 10 rounds etc, then a thorough clean with bore cleaner when I get home.I am switching all brushes out to nylon right now.