The cases are once fired and annealed.
Those are not lube dents, they are pinch folds, from sizing down too much at once.
Annealing makes it worse, unfortunately for you. Anneal after sizing down, not before. I've encountered this when forming 6.5 Creedmoor from 308; maybe 1 or 2 in 100 when sizing once fired brass, but if they are annealed first, every single one does it.
I haven't looked at the case dimensions - could you use a 338 WM die for an intermediate step?
