Ran into a lkittle problem the other day.
When mounting a scope on a new (to me) rifle we (the more experienced & myself) noticed that the mount holes for the bases didn't seem to be directly over the bore. We fiddled arround a little bit, went ahead and lapped the ring went on our merry way to the range. There I observed exactly what I thought would happen. Less than an inch grouping at 100 yds. bu when I moved to 200 all my shots were exactly 3 inches to the right.
My fear is an improperly drilled receiver. Thoughts?