Had the 223 at the range today tuning with 80 gn Bergers with good success. Had about 35 brass that needed to be fireformed to this chamber so I loaded them with 8208 and sierra 52 gn target bullets. I was expecting NOTHING in the way of accuracy out of a 7 twist bbl but was surprised to get sub 1 inch groups with 5 different powder charges. The groups were mostly 3 or 4 in a quarter inch then the "fliers" made the groups 1 inch or smaller. The range was 200 yds...............Imagine, a load used far from it's intended use performing like this? Blew me away.