Have a Ruger m77 mkii, 300 win mag. Hand lapped barrel before shooting. Went through a strict barrell breakin. Best i could get is 1 1/2" out of handloads and the best factory ammo. Just for chits and giggles i grabbed a box of Rem 180gr xpress. The Cheapest ammo you can buy. 4 3shot groups that clover leafed. This box had been on the shelf for a couple years so next time I was at wally world grabbed a new box and had the same result. It has dropped several deer out to 650 +/- with out fail. Just sayin some guns like the cheap stuff.
What procedure did you use?
