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I have been using 4227 :
18.0 gr IMR 4227
LC brass
Lapua 100gr HPCE
shoots very well from My 16" AR as super sonic load
My favorite subload for my Ar (1x10 twist barrel) is:
10.5 gr 4227
CCI 400
LC brass
Hornady 190gr spbt
COAl 2.240"
Hope this helps.
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