I have owned a Model 7 in 260 Rem for over 10 years. It came with a 20 inch very thin barrel and I never could get it to shoot as well as I expected it to, so I replaced the factory barrel with a Hart 22 inch one. Here are some of the velocities that I have gotten with both barrels.
Factory 20 inch.
129 Hornady SP 2724ft/sec average
120 Barnes TSX 2778 ft/sec average
Hart 22 inch
120 Barnes TTSX 2952 ft/sec average
120 Nosler BT 2957 ft/sec average
130 Nosler Accubond 2922 ft/sec
All loads were shot over a CED Chronograph