If you hit a target 1 in 6 shots your dope is close and may even be perfect. You've 'found' the target.
Either the target is too small for the shooting system or there is something wrong with the system (or both). The system includes you, the potential of the gun, the capability of the ammunition, the stability of the rest, and what the weather is doing at the time of the shot between you and the target. The system includes you so it may be that you need more practise...We all need more practise.
Be careful of 'chasing the spotter' when the system is producing large groups. Correcting subsequent shots based on where the previous shot went relative to the point-of-aim can send you off the target pretty quickly if you don't appreciate the concept of a group.
It is unusual that with a 308 you can hit at 500 but have sketchy results at 600, unless the target is smaller than your ability to shoot at that range, or something in the system has changed (e.g. the wind was less predictable). Are you using the same size target at these ranges? How big is it?
Either the target is too small for the shooting system or there is something wrong with the system (or both). The system includes you, the potential of the gun, the capability of the ammunition, the stability of the rest, and what the weather is doing at the time of the shot between you and the target. The system includes you so it may be that you need more practise...We all need more practise.
Be careful of 'chasing the spotter' when the system is producing large groups. Correcting subsequent shots based on where the previous shot went relative to the point-of-aim can send you off the target pretty quickly if you don't appreciate the concept of a group.
It is unusual that with a 308 you can hit at 500 but have sketchy results at 600, unless the target is smaller than your ability to shoot at that range, or something in the system has changed (e.g. the wind was less predictable). Are you using the same size target at these ranges? How big is it?