I was out yesterday helping a friend pull data together for his 6.5 CM in a Ruger Precision Rifle. Using the 143 ELD-X and 42.1 gr H4350. Labradar gave me a velocity of 2650 with SD about 10. Applied Ballistics gave me a come up of 13.5 moa with a 100 yd zero. We then set up a target at 600 yards and shot a 5 shot group with this come up. Group was at 1 moa but 20 inches high. I had to adjust the velocity all the way up to 2994 to get the correct solution. I have never had such a large adjustment before (I usually only need an adjustment of 50fps or less when doing this). Can you see any reason for this result? My own 6.5 CM with a 24" Barlein #4 comes in at a validated 2800 fps.