ok. just bought a used 700P .308 26"BBL. came with a cheap scope. took it to the range today and seemed ok at 100yds. took it to 200yds and the 1st few shots were ok. then all hell broke loose. i was off ALOT the next 10-15 shots even when i was adjusting scope. my question is, is this scope toast? could it be the BBL? does a bad BBL act like this?