Ok , I had to put together a new load for my .338, and I am heading out west in a couple of days. I was only able to verify a couple of distances this weekend and I will have a little time when I get to hunting spot to shoot. I have verified 300 yard zero/ 800 yards/1140yards I have played around with my ballistics calc to give me correct values. Actually it gave me correct comeup from 800 to 1140 sunday first shot was perfect elevation missed the wind just a tad, but elevation was perfect. How many more distances should I need to check before I can be confident it will be spot on. I kinda think it is now, but everytime I think I have it figured out I get humbled. Also I had to lower muzzle velocity from 2840 to 2740 in calculator to get right dope. Should I have played with the B.C. instead ?