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Ok with all of my load developement using Sierra 220 HPBT and AA1680, Hodgon H110, and AA#9 no 3 shot groups smaller than 2".
Coal is ok. Brass and primer the same.
AA1680 10.30-12.5 Worst groups at 3"
Hodgon H110 9.1-9.5
AA#9 8.6-9.0
I have a(SSK) AR-15 10" Upper on a RRA Lower Receiver. I am shooting this with a AAC Cyclone Silencer. The optics are a Nikon Monarch 4-16 with a Mildot reticle and Burris steel rings. All is tight and has never had to be retightened since build. Silencer is on tight as well.
Should I try a factory load that will give me better results
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