Free: Contests & Raffles.
Was that group all at 25 yards? If so here is one thing I have not seen mentioned. Remember each click at 25 yards only moves the 1/16". You would need to move the scope 16 clicks to get the group to move one inch at 15 yards, so not terribly surprising that you were not noticing the group much as you've described. Your group appeared to be off by as much as 4" which would require the scope to be moved 64 clicks to the left to bring it to dead nuts on the bullseye at 25 yards.
I just gotta get ahold of a bore-sighter before this weekend. I tried doing it at home by placing a target on the wall and looking down the barrel, but I don't know if that worked so well. I may just have to break down and buy one...