Lawnboi
WKR
Did you torque the action to the same spec? When you put it back together?Bumping this for a similar issue. I worked up a load and verified it with my standard practice- ensuring consistency between 3 distinct three round groups loaded on different occasions. The largest of these was 2/3MOA. Then shot a 100 yard group today with the exact same load, and the group was right around 2 MOA and center of the group had shifted probably 2 inches down. This is a Winchester Model 70 Extreme Weather SS wearing a Nightforce SHV in Warne rings that I personally lapped, checked the alignment on and assembled. 99% sure no screws are loose. Bullets are Barnes TTSX. Only modification between load development and today was removing the trigger to change the factory springs out for the Mcarbo spring kit. Ideas?
Is the rifle bedded? Could you pulling the action and replacing have caused a shift?
Same lot of bullets?
Was the load made with virgin brass that is now on its second firing?