I think a lot of it has to do w/how people measure the group. I was talking to a guy the other day that was bragging about his groups and when he showed me the target I questioned it only to find out that he was measuring from inside edge to inside edge.

I don't shoot a lot because I don't enjoy shooting paper. But when I do shoot, I shoot 3 shot groups and call it quits. I shoot each gun I'm gonna hunt w/each year 2 or 3 shots prior to the season to make sure it's still lined up and then that's it until hopefully the next time is on meat.