The conventional wisdom is as noted above, however I have not seen any significant difference in my rifle loads ( 11 different rifles), but have noticed that handgun accuracy is significantly affected by brass brands. I keep the rifle brass sorted for sake of measuring longevity for safety sake. For handguns when accuracy is important (vs plinking) I just am sure to sort for brand when I load up the gun.
Powder and bullet combonations and to a lesser extent brand of primer affect accuracy more than brand of brass in my experience. YMMV
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