I am having the exact same problem with my 223. I have tried the following powders with 55 gr. hornady spsx 2230 - H335 - BL-C(2) - and H414. The H414 is the best so far, but some of the others have been really wild. Two might be 1/2" and the other off the target. If you figure your problen out, please let me know.[8D]