Wind is never consistent so it will open up your groups no matter how well you can read it. Faster bullets are not as long exposed to the wind as slower bullets so a 180 grain .308 will be less accurate than a 180 grain .300WM.
And I have never noticed that harder recoiling rifles are less accurate, thats BS. If hard recoiling rifles would move so much that it negatively affects the bullet while its moving down the barrel we would all have to chop down barrels of your magnums to make them more accurate.
