I just put a new .223 barrell on my encore. I zeroed it. After about 20 shots, the group shifted 8" high...I sighted it back in, and all was ok for a bit, then I was shooting 8" low all of a sudden. I checked the rings/bases and they seam fine. The groups are not stringing at all. Is there something inherent in the encore that I should looking at, or can I assume the scope is the issue?


















































