Its very unlikely that factory ammo will be optimally tuned in your rifle or even that it will stay that way in different conditions.
If its a hunting rig you will want to shoot it in the conditions your going to hunt in (same temp and configuration)
I'd suggest shooting groups in those conditions and seeing which groups the tightest and fiddling with your rear action screw torque settings to see if that can bring the last shot reliably into the group. This works well on savage rifles not sure about 70s.
If its a hunting rig you will want to shoot it in the conditions your going to hunt in (same temp and configuration)
I'd suggest shooting groups in those conditions and seeing which groups the tightest and fiddling with your rear action screw torque settings to see if that can bring the last shot reliably into the group. This works well on savage rifles not sure about 70s.