Nearly all of my clients thus far have asked for a heavy barreled 6.5G/.264LBC.
This is how my last client's gun turned out. 20" Match Bull Barrel from Black Hole Weaponry with a simple Hogue overmolded forearm, mated to an aero precision, trued upper receiver.
His lower consisted of a PRS stock, JP Enterprises Speed Trigger set at 2.5 first stage, 2lbs 2nd stage. He called me from the range the first day he shot it saying it was shooting itself... had me scared... he claimed that he put it on target, and each shot seemed to go exactly in the same spot. He convinced me so much, I had to build me one. It's a work in progress.