A few weeks back I went to zero my muzzleloader and I was finding the my scope would not respond to turret adjustments. I went back to the range a few days later and the POI had shifted to where I was originally attempting to move to. I went back a third time and the POI had shifted again. If all of the mounting hardware is tight on the bases and rings and the barrel were cleaned and seasoned; There has to be an issue with my scope itself, correct? I am looking for some ideas to start investigating. Historically my ML was very accurate, stored after being cleaned lubed and seasoned, and had not been hunted with for a few years. I would prefer to not have to but a new barrel if I can avoid it. Any thoughts appreciated.
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