For brass , I have had good luck with Starline and Winchester . Some say Winchester doesn't last long but I've had " long life " using Winchester . For primers . I have used Winchester , CCI and even the Russian primers (Tula ) when that was all that was available yrs ago . I did have a few , very few Russian primers that were duds . I can't tell you about Magtech nor S&B . For bullets , I cast my own . My most used is the real Keith , H&G 258 . I have occasionally used Berry's plated bullets with good results too . For powders , lots of good powders . I use Winchester Super Target for target loads . Winchester Super Field for my mid range loads . IMR 4227 is my magnum powder of choice . I give up a little velocity but enjoy great accuracy . For dies I use LEE , no problems . Good Luck , Regards Paul