I have always used Remington Peters cases without any issues, I dont like Winchester cases, I tried Norma, cost more and didnt get any longer case life. I have been loading some Federal cases in my 338 Win mag, they seem to work fine, I got them because when I first got my 338, I couldt find any brass and bought 4 boxes of Federal premium ammo loaded with 225gr Accubonds. My perferd brass is R-P. Just my opinion, i am sure others have different preferences