Like Art, I do well out to 300-350 with my .223. I run 55gr Hornady V-Max's, Privi Partizan cases, small Win primers, and near max 26.5gr of Varget powder. That seems to duplicate the 55 factory Privi Partizan and Academy Monarch brass loads I chrono'd 5-6yrs ago- just much more accuracy.
Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)
I'm going to use the words "clip" and "Long Colt" every chance I get. It grinds my gears to see new members attacked when we all know dang good and well what's being refered to.