Now you are starting to make things difficult.To do a fair comparison you must take into account that the lighter bullet can be driven at higher velocity than the heavier bullet using the same gun.The best that I can do with this manual is a comparison of the .308" -180gr matchking vs the .308" -220gr match king.According to this manual the same gun(300 win mag) provided 2700fps for the 220 gr bullet and 3000fps for the 180gr bullet.bullet drift for the same 30mph wind was as follows
180gr match king-100 yards-1.58" 200yards-6.53"
220gr matchking-100yards-1.58" 200yards-6.48"
Even though both bullets were match kings they are not exactly the same shape as the 220gr bullet is longer and therefore has a higher ballistic co-efficient.
To really complicate things I will throw in the data for a 168gr matchking fired out of a 7mmremmag at 3000fps and the same 30mph wind
7mm-168gr matchking-100yards-1.39" 200yards-5.71"
In this case the 168gr -7mm bullet is the lightest of the three and is the same basic shape as the other two yet it is the least affected by wind drift.
The 7mm bullet is also being fired out a cartridge of smaller case capacity than the two .308" bullets.
Once again heavier weight does not result in less wind drift.