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It has to do with a lot of factors, but two are bullet weight and time in the air (velocity). The longer a bullet is in the air the more time the wind has to deflect it.
If a 500gr bullet and a 50gr bullet are in the air for the same time the 50gr one will be deflected more.
If you have a 500gr bullet moving 1000fps and a 50 grain bullet moving 3000fps the slower one will be deflected more.
Surface area of the bullet too I think is a factor, such as the design of the bullet, but I have not read up on it for a while.
Are you trying to decide between different cartridges?
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