Think 45 is near max with 2209 and 140's though no?
Think 45 is near max with 2209 and 140's though no?
Yeah ADI have max as 44.0gr for AR2209 but I was told this was to keep them safe with all the old mil surp rifles out there.
I too had slight ejector marks at 43.0 as well but figured it was ok when 43.5 didn't have any. 46.0gr did give me a very slightly sticky bolt lift but not hugely noticeable.
I've settled on 46.5 of 2209 with 123's, pressure was fine to 47.7 but groups opened up again.
No chrony so have no idea of speed, but it groups so damn well at 46.5 I'll run with it.
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