I have been using Remington 300 Rum necked to 338 in my edge and brass is junk. 3 loads and primer pockets are gone. With my Bertram DE brass I have reloaded test set of brass 15 times and pockets are still good to go. Another thing is my run out is always .0015=.002.
Bertrain brass is the only way to go with the 338 Edge.