Weight is only weight and doesnt really have much to do with aerodynamics. Areodynamics are based on design. Think pointed bullet vs blunt nose in simple terms
If speed is the same, the bullet with higher bc will drift less.
In your case, A lighter bullet with a higher bc with drift less than a heavier one with lower bc due to the gain in bc, you will also see a 2nd gain because lighter bullets shoot faster.
A lighter bullet with the same bc as a heavier bullet will drift the same amount if they are shot at the same speed
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