637 yds on a Muley Doe with a 168gr sierra MK in .308@ 2550fps. That was pushing it for the setup I had. Leupold 3.5-10x40 with flat base. Scope was almost maxxed out. Since I got my .300 RUM my longest shot is 300yds. lol
I out did my personal best this year. I shot a mule deer buck at 952 yards with a Best of the West Signature series Cooper Rifle chambered in 7mm Rem Mag shooting 168 gr. Berger VLD's. Look for it on the Best of the West next season.