Take your favorite .308 load and the gun to a range with at least 100m, and preferably 300m target bays. Start at 25m and zero for 100 m or 200 m. Move to the 100 m bay and fire 10 rounds, letting the barrel cool between each round. Adjust the sight to correct for elevation and windage (hopefully you won't really have wind to compensate). Fire another 10 rounds at another aiming point. If you do this using a rigid bench vise, you should be well within 1 MOA. Now move to the 300 m bay, and repeat.
This is all predicated on your being able to get quality ammo, i.e. consistent velocity and bullet weight. If you are reloading, you've got a better chance. You can try the standard NATO military round, and then compare it to something loaded with Barnes, or Hornady, or other.
Milsup:
2820 fps & 2650 ft-lbs with a 150 gr. boat tail solid point.
Your mileage will very a lot depending on what you're really shooting. Having a rigid gun mount will eliminate any shooter "flex" and give you a gun sighted in and well capable of splatting a fly on the target <- I love that Savage ad!
