Vertical stringing

[LHSmith]

If it's not a rest induced problem (make sure your "BR type" rest is not pinching the stock), look to the powder charge. Record temp. at each session because it does affect velocity. Just to eliminate potential causes, make sure you use a mirage shield.

 

[conor m]

fast , have you stripped down and cleaned the bolt and the trigger assembly . i know that this can cause a slight variation in the lock time which inturn can cause vertical.
strip both down and see if this helps.
conor m

 

[Macropod]

You might have a dud barrel.... It happens sometimes...

Usually the group tends to be sporadic but not always. I found that out the hard way.

Often a bad barrel will prove difficult to develop a load for (hmm... no kidding). And if you do find a load that sort of works, it will still go off tune. Finding this out is gold, it is getting to the discovery point that drives you nuts...

 

[savagedasher]

Is the barrel free floating? If it is try putting it in a rest . Then check it. Too hard rear bag of front causes vertical. Beading can also make problems. The rear bolt behind the trigger can be too tight.
I adjust vertical with powder charge. Larry