Originally Posted by huntersmurf
I've tried a number of things including letting other people shoot this rifle. The group size has increased to 2-3'' range which is not acceptable in itself but location of the groups bothers me even more. Sometimes it's to the right,left or high. I'm wondering if the barrel is changing what it likes now that I'm getting more rounds downrange. I've not had this happen before,so could that be a possibility?
Sako builds a high quality rifle,and with the number of rounds you say have been shot out of it,the barrel would be the last thing that I would suspect being bad. Unless the rifle has been dropped and the barrel was damaged,I would say your troubles are with the stock,receiver bolts,scope bases or the rings.
Check to see if your barrel is free floating in the stock first,if it is,then check the torque settings of the action screws. If all is well,take the scope & rings off and check the base screws,rings.
If everything checks out ok,shoot the gun without the muzzlebrake and see if the problem goes away. Whoever installed the muzzlebrake could have screwed up the barrel if it isn't true to the muzzle of the barrel.