Ive got a 22" barrel on my Model 70, Burris FF 3-9 shooting 168 A-Max & MKs shooting out to 300yds getting about 2700fps @muzzle, it usually shoots under MOA at that range, I too would stick with a bit heavier bullet than a 150 out to 600, but if youre shooting a good bullet like a 150Interbond and alike you should have no issues and if you can hold a 10" group at 600. I plan on trying a 600 yard shoot next month, curious to see how my rifles and I do.
