I haven't shot them from the bench, I'd just finished the safety workup for the powder I was using, WC872, and the 140gr CC bullet when I went to Fort Sill. I should be back at to Fort Knox at the beginning of next month and can get to the bench.
The load I used should be right at 2,400 fps, which with the high BC of the bullet just fine out to 600 yards. I've used CC's in my 308 accuracy loads with excellent results (every bit as good as Sierra), and the few high power shooters I know still using 308 recommend them in 155 and 175 grains.
Machine guns are awesome until you have to carry one.