The only rounds today that need belts are the straight ones without rims, ie: .450 Marlin, .458 WM, .458 Lott, .450 Watts - oops, that's not a modern one, but the original .458 Lott.

Putting a belt on a case that will headspace perfectly off the shoulder is just anther 'thing' to sell - it does nothing to help.

Of course, that's just my opinion.