Couple of questions... I recall M-16s in Viet Nam had problems with dirty powder. Anyone know what powder that was? And what powders I should avoid loading for AR-15's, due to the same problem? Maybe I should just use that CFE223 to avoid any problems. I have plenty of H335 at home now... Does everybody use the hard military primers, or are regular primers OK in this gun? I'm guessing the military ones are hard to find.