I have had 2 identical rifles (1 from '04-08, and one from '12-current), b/c the first one got stolen from me back in 08. They are/were Browning A-Bolt II Composite Stalker w/ BOSS in 7mm RemMag. The old one had an original Bausch & Lomb Elite 3000 Firefly 3-9x50, and the current one has a Kahles Helia KX 3.5-10x50.
I just got this new one a few months ago, so haven't had a chance to do anything much other than a Rifle Basix 1.25# trigger spring & trigger job, and a 100 yard zero to tune in the BOSS for my handloads.
My other one I have taken several deer well over 300 yards. My furthest free-hand standing shot in a treestand was 476 yards, with that gun shooting (before I reloaded) Federal Premium 160gr Barnes TSX Triple-Shocks w/ the XLC coating. It had no problem laying the smack down on a whitetail at that distance. You gotta love a flat-shooting caliber.