Hillajam, Winchester or Remington brass isn't bad if you're willing to spend some time on sorting, de-burring and uniforming… a bag of 50 is going to run you about $22.00. If you want brass that is already weight sorted and cleaned up, try the Nosler Custom. A box run 50 will run you about $48.00. My 300 is used mostly for hunting, so a box of 50 is about right for me and lasts a while. Lapua and Norma will cost more and unless you are competing and need the best, may not be worth the extra money.