Several years ago I was at a range that had strong winds crossing directly right to left, I'm guessing 20+mph. I stood protected from that wind next to my truck so I could easily hold on target. I aimed at the right edge of the 80 yard bales expecting that wind to push those arrows at least a couple feet. I was using 500gr .204" ID arrows, 30" long, with FP's and three 2" QS Speed Hunter vanes. I was shocked when I got to the bales and all three arrows were right at 2" inside the right edge.
Now I did that again later on with my 125gr Shuttle T BH's at the time, and they consistently hit 18" left of aim point. Shot a 125gr Grim Reaper and it hit with the FP's. That was the year I started carrying a couple mechanicals in my quiver after experiencing that. Shot a big bull that year in a little bit of wind right at timberline at 59 yards quartering away with the mechanical. Dead bull.
Whatever you shoot, just make sure you test your equipment in every kind of situation you can think of that you might experience while hunting.