Wandering groups are usually the red dot or scope .
Make sure every thing is tight and then carefully shoot , from a bench , 10 different 5 shot groups on 10 targets. Number them 1 through 10 in the order fired . With mine , you could actually see the groups wander around on the targets , not one group stayed in one place. Boxed the sight and targets up with a letter and returned to Bushnell...they fixed it , no problems after that.
Targets don't lie !
Gary