222 223
Steve here...
I too have been using n133 for years... had great results in all my ar's
7/7 twist 8 twist and 12 twist. 14 twist 222 40xbr only gets n133
I only use the n133 with light bullets (52 Bergers 52 or 53 Matchkings or 40 Vmax's). I have fumbled with n135 and n140 with...