Proper Head Bobbing Method

Haven't tried it with a laser but I'm not talking about a quarter inch of movement. The movement I noted was very large-several inches at 25 yards with a very light touch on the eyepiece with a stable gun sandbagged on a bench. The gun could not have moved enough to see that much change. The gun itself has proven quite accurate with other scopes but would not group with that scope. Maybe that scope was not focusing accurately or had other internal issues but the movement noted was disturbing. That was the reason I switched to use scopes with locking eyepieces when possible and most of mine now have that feature. I never noticed the issue until I passed 60 years of age and needed the eyepiece screwed almost all the way out to focus the reticle on most of my scopes. I've never noticed it with any of my other scopes that have locking rings on the eyepiece. I'm not an optics expert but with that particular UTG scope it was a problem. If it is not a general possibility and I had a bad scope then that would be good to know. But in the case of that UTG scope focused for my eyes slight movement of the eyepiece did move the reticle off the target.