I've been trying to begin shooting at longer ranges lately and finally hit the 600 yard mark. I'm using a .308 with 168 SMKs at 2740 fps. I'm using the Shooter program on my smart phone and the vertical MOA is pretty close, but I'm struggling with the wind. I've shot at 500 yards twice over the past two weeks and 565 once and at 608 yesterday. The wind has been variable at 8-12 mph changing from 45-90 degrees for the wind angle. I'll dail for the wind and let 3 fly, go check and 2 bullets will be together almost like there was no wind and a third will be where I dialed for wind. This has been the other way as well. So I'd go back and think well the wind isn't that bad and I dail for less wind about 1.5 MOA and shoot 3 more and 2 will be far left from wind movement and a third hit as is there were no wind. The last two groups at 600 were actually together. The first group I dialed for 2.5 MOA of wind and hit about 6 inches right as if there wasn't much wind but the 3 shot group was 3.75", the second group I dailed for less wind and it was almost centered but a little larger group at 5.5". With all this said I mainly feel that I'm just new at this and have a problem judging the wind with each shot. Would choosing a different bullet help? Maybe the 155 Palma MK, or the 175 SMK?