I've tried shooting groups with the V3 magnetospeed on and the load that shot the best without the magnetospeed on shot the same with it on..
I just happened to be chronying the load that shot superbly and rather than just bang off 5 shots into the backstop I fired 1 shot at the target.. I adjusted the elevation up then aimed at the bullet hole and shots nearly all went in the same hole. The shot that stepped out the group a fraction was probaly driver error