I love my .17hmr! I have an older marlin with a heavy barrel and a cheapo tasco scope on it. Average group shooting outdoors off the bench is .75 MOA at 100 meters.
However for the real accuracy, I break out the 6mmBR with the pieces of night force glass bolted to it! <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />