Okay I'll disagree just to be ornery. I use Winchester ,Remington and Federal brass in my '06 and can't see a wit of difference in hunting loads. Same with the .243. Having said that, I wouldn't recommend mixing military or off the wall brass ie. Imperial in the mix. But the more common brass all works fine. I've weighed them all and the Remingtons run a little heavier and the Winchesters run a bit lighter.....nothing to fret about. Now if you have aspirations of Camp Perry........that's another story!Regards, Rick.