Re: Clean round for AR-15
My first choice would be Varget; there are several good powders for .223. You'll get a few more opinions before long.
Not sure that you'll get any decent accuracy even at 100' out of an 11" barrel. 100' is your max, so you may get half-way decent groups. I've never shot an AR with such a short barrel, so you'll have to keep us posted on your range results.
What are you gonna do, talk the alien to death? -- (on Sigourney Weaver's worry about Guns in Aliens)
"Safety is something that happens between your ears, not something you hold in your hands."
"I carry a small gun to compensate for my huge Blue press."