Did some field shooting with JR and his new Edge a couple of days ago. It has a Broughton 30" 6 flute tube, a 700 action, HS Preecision PSS stock, DE cheekpiece, custom slab brake, Nightforce 40 MOA base and LW rings, topped with a 5.5-22x56mm NXS NPR1. In his initial groups he shot several under 1/4" @ 100 yards!!! We spotted a rock across a canyon that looked like trouble and was about to charge so we deemed it a target of interest. I lazed the distance at 1693 yards. JR dialed up 50.50 moa per the Exbal PPC program, (894 inches or 74.5 feet) I read 1.25 MOA left wind and told him to send it. I watched for about 2.5 or 3 seconds for the trace to drop in to the target area. The shot landed 1.50 MOA low windage spot on. We started to look around for the cause of the low impact and noticed the wind at our backs was dropping into the canyon giving us a slight down draft. I called up 1.50 moa and Jr fired, I watched the trace drop right into the rock just high of center. Once was luck hit it again! With that Jr loaded and fired another round impacting on the rock within 5 inches of the first hit. Shooting in canyon country is difficult at these distances just the slight 2 mph wind coming from behind us was enough to ruin a first round hit when uncompensated for. The tough part once you notice these conditions is trying to guess their effect. It just takes more trigger time in field conditions.