Thanks, there's not a lot of load data out there. Did you get some decent groups an speeds with that load
Accuracy has consistently been MOA or better with 1-10" ROT barrels and sub-MOA in a 1-14" ROT barrel.
Speed with that load, +/- 0.5 grains, runs between 3,500 and 3,650 fps in barrels between 21" and 26".
I use resized Federal 223/243 WSSM brass and have used a variety of primers, but have settled on CCI 200s.
For a few years there was a site dedicated to the three WSSMs and their necked up and necked down off-spring,
www.wssmzone.com, but it has disappeared along with all of the good WSSM information found there in.