I've shot a lot of BL-C2 in my 223's. I like the way it meters and its accurate enough to suit me. 5 shots will consistently group into 9/16's to 5/8's. But a safe load here in Arkansas will flatten primers in the Texas Panhandle in the Spring and Summer.
That's where real temp stable powders come into play and are highly appreciated. The op is getting some great info.
