I for one don't like nickel brass. It tears up my dies, doesn't seal well in the chamber, and won't shoot for me as well as brass cases. Tried it in my 270 WSM and could not get the shiny nickel cases to shoot well so i pulled the bullets of the rest of the box and trashed them. I think this pretty ammo is just for looks.
I understand that nickel is harder than the steel in my dies and harder than the steel in my barrel. Kinda like using a stainless steel brush to clean your barrel. Basically a no-no.