Long range shooting, a heavy bullet is what you want to retain energy and its also less affected by wind.
If I wanted to shoot a muzzleloader at long range, a saboted spitzer would be my choice. Higher BC and higher velocity than any bore-sized bullet.
It's not the weight of the bullet that bucks wind, it's the BC.
Of course if you want to shoot long range with sabots, you may as well just use a centerfire.
