I've got an A-Bolt stalker in 7-08 that I've had for quite a while. I'm sure its 1:9 1/2. I have a Leupold 4-12 VII on it and it will group into a dime with Fed premium 140 gr ammo at 100 yds. Believe me-its the gun. Its a great round and probably responsible for killing off the 7x57 in the USA.