I find it as good as anything out there, at least in hunting rifles. Nosler's +P .257 Roberts brass has proven to be interchangeable with WW +P in my rifle. Regardless of brand, I always run my new brass through the FL die and back over the expander plug, give the necks a quick deburring twist, and run a flashhole deburring tool into 'em. I'm not sure it is necessary with Nosler brass but I prefer to control consistency myself rather than leave that in someone else's hands.
Tom