Something to try, Hodgdon is conservative in load data
Barnes is the opposite with their unique bullets. That bullet should work well
with H322 one of my go to powders..Funny thing about Barnes bullets is you are usually safe to use others load data on their bullets but Barne's data should never be used for other's bullets. They are unique (Barnes) and their design allows more of everything. Don't take this lightly if they don't list a load you have powder for you can with caution extrapolate data from other bullet/powder makers.
Work up to this! My own load !
23 Gr. H322
Lake city 08
CCI-400
Barnes 63 TSX
The bands in the shank allow for higher speed with a pressure reduction.
$$$$$$$$$$$$$$$$$$$$$$$$$$$
Lee's load book for the 63 grain Jacketed:
H335 22.5gr min 25.0gr max. 3051 FPS (BOLT GUN LOAD!)
$$$$$$$$$$$$$$$$$$$$$$$$$$$$
Sierra's Load book edition 5 has Loads for their bullets only, 63 grain bullets:
http://accurateshooter.net/Downloads/sierra223ar.pdf
RL-7 18.5 min 21.5 max 3000 fps (Listed as the accuracy load)**usually is and indicator for a good load. proven, tested, true, (BOLT GUN LOAD!)
H335 23.2 min 26.4 max 3100+fps (BOLT GUN LOAD!)
reloader 10X is for 55 grains and less fails to group...
Powders you should also try,
Tac, Reloader 15.
Sierra's accuracy load for the AR-15 is:
63 Grain SMP ,H335 25.2 REM ,7 1/2 ,2900+fps
Try the reloader 7 and let me know...