The Column headings that say "16" Proof" and 10.5" BSF.  Here is what that means:
Both Carbon Fiber barrel offerings.  16" from Proof Research, and the 10.5" from BSF Barrels.
The proof is more accurate than the BSF with these loads, but both are good accuracy.  This is 50 yards.  These are mostly 8 shot groups, some are 7 shot groups.  The bottom left 2 groups...the proof 16" and the BSF...using Benchmark 25.0 grains.  That is ~2940 FPS out of the 16" barrel.  And thats sub MOA for both.  That 1 flyer on BSF was first shot after cleaning...then I dumped 7 shots within about 1/2 inch there. 

The AR Comp 24 was also acceptable load.  That was like a little under ~2800 FPS.  And the 2230 was ~2930 FPS, and the 2460 was ~2890 FPS.

For these tests, unlike almost everything else on this site, the bullets were NOT weighed, the brass was not measured for volume.  The guns were also shot, not using hard rest, but the shots were pretty good, with no human error beyond .2 MOA, where normally, the human error might be within .1 MOA. 

So Benchmark is best load at 25 grains with the 62 grain, AND Benchmark was the best load using 55 grain Sierra bullets, as well as 64 grain Game Changers (23.7 grains)

So we have to say, since we have every powder and 30+ different bullets now in 223.  Benchmark is "probably" the best all around pick for us between 50-65 grain bullets.  Its absolutely ideal.  Top tier accuracy, temp insensitive, and high velocity. 

Please NOTE.  This Proof Barrel and the BSF Barrel here, are about .2 MOA to maybe .4 MOA less than the WOA or the Shilen barrel that I have in 20".  But we are not competing here...sub MOA is FAR FAR good enough.