Had a similar thing going on with a 25-06 I built, was pulling my hair out asking other guys questions, and doubting my ability to shoot anymore, ( don't shoot as often as I used to). I changed my rest and was trying to dry fire without the reticule moving , couldn't make it happen,it bounced every time, was refocusing and noticed the eye piece loose both visible and by feel. Worth taking a look at, luck that I noticed what was going on.A tikka that won't group is scarce.
