up drafts and misses

[MMERSS]

We just began learning of this in WVa with long range varmint hunting and gong shooting over a canyon. At 1100 yards my 300 RUM should have Needed 21.25 MOA up and 1.5 of wind based on the wind at the shooting position. That put me 1-2 MOA high and the actual wind correction needed was 3-4 MOA. It's incredibly challenging shooting across those hollows. I kept going back to my ballistics program to try to figure out why the elevation was off and where the error was. There was no error. There was an imperceptible (but significant) vertical wind across that hollow and it changed by the second.

Digging up bones! Yes canyon shooting is a challenge......a good reason to shoot the best BC bullets with the highest velocity all the while maintaining precision.