I've fired a couple of 601's and a 603, outstanding!
Everything you would expect from a "10M" rig except so quite you couldn't tell it fired, good thing I hit the target.
Now while perhaps not 100% normal, I squaded with a fellow from TX using a 603 in TN at either the Nationals or the World's (FT) and he used an FWB603 shot in the 50's that day, insane.
Great rifle with perfect balance, excellent fit, nice trigger, flawless groups and reasonably priced, for what it is.
John