Haven't shot that combo out of my AR-10, shoot 168 A-Max. Just suggesting you use LC brass. Gas guns shew the crap out of commercial brass. The LC is thick and can take the abuse. Was using 4064 on my DPMS 308 but sold that and now shoot a 12.5 barrel 308 AR with 8208. Have found soft points load a little different than the A-Max. Can go dig up the data if you think the 168 data will help, which should be very close to the 165 your shooting.
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