Jim, sometimes heavy bullets hold velocity better. Other times, they won't. Depends on their shape in addition to their weight.
Given a choice of a bullet that has 20% better accuracy or one that bucks the wind 20% better, I would use the most accurate one. I can correct for wind drift. But I cannot correct for accuracy.
US Navy Distinguished Marksman Badge 153
Former USA Palma Team Member
NRA High Power Long Range High Master
NRA Smallbore Prone Master