I have found that BM8208 is very good in my 223. BM2 was pretty good but 8208 gives me consistent sub 0.5MOA.
Have some AR2207 to experiment with for a faster burn in my short barrel to reduce muzzle flash (with is quite sectacular at night) but i don't expect it to match accuracy of BM8208. Recon it will be just under MOA but no better.