I recently ran into a good deal on American Eagle .223 ammo (at of all places gander mnt.) 1k rounds for 349.00, nice ammo box included plus the clerk asked if I wanted to apply for a gander M/C , I answered with "if you'll take 10% off my total ?" to which she answered " I can make that happen". I buy loaded ammo, fire it and harvest the brass for reloading. Hours later I saw that Dunham Sporting goods had American Eagle 5.56x45 for the same sale price 34.99 per 100. My question is (and forgive me, I know it's been asked before) what is the differance between the two ( as it pertains to the brass). Both american eagle.