What 6,5mm do you use for deer, and what velocity do you get?
Myself I use an oldfashioned 6,5x55 shooting 120-140gr bullets from a Rem 700 Classic. Velocity is between 815-890 meters/sec (app 2450-2700 ft/sec).
Not in any ways a speciality rig, but coupled with a Zeiss 6x42 with target turrets, spotting scope, binoculars and a Leica 800 rangefinder, it gets the job done.
Haven't had a chance to shoot deer beyond 450yds with it.