I have never met Tom, so I have no idea what he would/wouldn't recommend. I was merely stating where to shoot long distance, and that a coworker knows the guy that runs the joint. For 500-700 yards, I would also go with .308, BUT, 500-700 yards isn't long distance to me. "Long Distance" to me is 1000+ yards. If you're mainly going to be shooting sub 500 yards with 700 being the absolute max, why not a quality long barreled 5.56? Cheaper match ammo than .308 match. http://www.impactguns.com/colt-accurized-rifle-24in-cr6724-car15-cr6724.aspx