+1 on N135 with 55 gr. bullets. My rifles like 24.8 gr with about any 55 gr. bullet. Also I have never found a powder that is the equal of N133 with 50 gr. bullets in all of my 223's. It burns very clean as well. Try some where around 25.0 gr. with Rem. 7 1/2 match primers.
Hope this helps some.
PaPa260
