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Ewww who would want that? Talk about fouling up your gas system! Unique is the dirtiest, powder I have ever had the misfortune of using. People would ask me if I was shooting black powder with the smoke cloud I would leave!
Buy a reloading manual!
Buy a reloading manual!
Unique is not suitable for a high pressure application like the .223. Try WCC 844. Widener's has it on sale every once in a while; eight pounds for $49.95. Great stuff, my bull barreled AR will group just over two inches at 300 yds with this stuff and the Sierra 69 gr hpbt bullet.