Heavy makes a rifle easier to shoot, well because it's heavier. As far as quality the bore is still the same , because barrel stock is barrel stock... turn it to whatever contour you like.
Heavier barrels take longer to heat up, thus more shots before things change. A lite barrel takes less, but the bore is still the same.
When it comes to the kill shot,cold bore is important one and it don't matter what contour that is.
I'm glad there are a few that understand....