after much hand-ringing and walking & talking to myself,i finally found a load that my 223 ultra excels with. all loads that i previously tried shot 3" or worse @ 100 yds, with major vertical stringing. but no more.
my new pet load is; 28.0 grs of AA2230 behind a hornady 50 gr V-max and a CCI 450 magnum primer. several 5 shot groups-all bullets touching in each group and no vertical stringing.
look out song-dogs,here i come.
dennis