Well here we go again. I just love to tear into old gun myths.
Myth: Heavy bullets buck the wind better.
Truth: Nope, heavy bullets are moved further by the wind because most heavy bullets also travel slow. This give the wind more time to act on the bullet and push it off course. That is the same reason heavy bullets have less range than light bullets. The time in flight allows gravity to act on the bullet for a longer period of time and pull it down to the ground. A light fast bullet will hit the ground in the same time frame but will travel further because of it's speed. For instance, if gravity will push a bullet to the ground in 100 nanoseconds (a ficticious time) then a bullet that is traveling at 1500 fps will only have 100 nanoseconds to get from point A to the place that gravity will drop it. A faster bullet such as a 22-250 at 3000 fps will go twice as far as the big heavy bullet before it hits the ground. (Ergo more range for the light fast bullet.) Back to the wind problem. A slow bullet will take let's say 75 nanoseconds to hit the deer. A fast bullet will take only 25 nanoseconds to hit the deer. Therefore the wind will only act on it for 1/3 the time that it will be pushing the big bullet sideways.
You get it?