Clem, I have heard horror stories about scratching sizing dies with nickel plated brass because it flakes, but I have neck sized and full length sized 7mm Rem. Mag. Winchester nickel plated brass down to 264 Win Mag in one step without a single problem and will continue to do this. I have inspected the outside and inside surfaces of the brass before and after sizing and have found no peeling, cracking or any other malady in the brass whatsoever. BTW, I use Imperial Sizing wax for case lube if this makes any difference.