grafs has Peterson 300WinMag Long brass...it's designed to headspace off the shoulder which is supposed to increase the number of reloads and reduce case head separation.
All 50 count listings of Peterson Cartridge casings come in one of their plastic ammo boxes. Made in the U.S.A. Match-Grade is a standard that must be held throughout the entire process of manufacturing some of the most consistent, accurate, and durable brass rifle casings available today...