I recently went through this (though with a different action, so the details may be a bit different), and essentially came away deciding the the Nosler case is just too long to really work in a standard long action if projectile seating depth is to be optimized.
In my situation, I was looking at the 33 Nosler, and found that in order to hit SAAMI OAL (3.34"), the base of the bullet (I was looking at 225 and 250 gr projectiles) would have to hang well below the neck/shoulder junction and intrude on powder capacity (this is where my application may be a bit different; I have a T/C Icon action, and the internal box mag measures only 3.500"). Getting rid of the belt was HIGH on my list of wanting to go with the Nosler case over the Win Mag case, but even using Nosler's own load data the 338 WM matches the velocity offered by the 33 Nosler (for 250 gr projectiles) using the powder that they recommend for each cartridge (though the WM has a slightly compressed load).
All of that being said, I have decided on 338 WM for that gun... but YMMV.