Quote Originally Posted by Quinny
I have tried several different 155gn bullets, but the rifle just doesn't seem to like them - I tried different powder loads and seating depths, but always the same result - in a 5 shot group, I will get 3 good shots and 2 bad shots on every group. With the 168gn Sierras, they were much better.

I will get a gunsmith to bed and true the action, and keep practicing for now until I can justify the money on putting a match barrel on.
Check the brass. Brass that is thicker on one side or not concentric can cause this. What is the runout on your brass and loaded ammo?