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53gr.vmax loads needed.

I've had great success, consistent 1/2 moa (when I do my part) at 100yds with 27.5 CFE 223, REM 7.5BR primers, COAL 2.825 (using Hornady comparator). This is my favorite load/bullet combination for Coyote hunting with the 223.
 
I have had decent luck in my rem700 1:12 twist and 53 vmax at 24.5 grs of benchmark, cci400, 2.25 col, hornady brass. The 53 gr smk flat bases ended up being more accurate for target shooting however.
 
I shoot 25.5 gn of aa2230 with the 53gn v-max in all my 9 twist AR's, strictly for hog and varmint. A devastating load. Haven't ran it over the croon yet.

If your going to try this powder start 10% lower and work up. 2230 is a pretty fast powder.