Peters, that is a real nicely put together rig and great goat. I would say in real world hunting that is a hell of a shot at 600 in those conditions congrats. If you are in the 3300 fps range with that bullet the difference in 30 to 40 mph wind is about 30" so you did real well and holding 30 was the right call. That kind of wind at that distance and a 120 grain bullet a lot can happen. Well done.