We ran the T-6's in hunter benchrest - they normally came in a 5.5 to 5.8 powder, so we sent them to Bill Ackerman and he would boost them to 6X on the nose and would put in a BR crosshair or dot if that was what you wanted. Only problem was weight, so you had to shave ounces somewhere.
Solid scope, as was the T36 and others.