I did some digging and found SSK's load info that also showed using less than 9 grains of 2400. I am just relatively new at this and didn't want to assume anything and get myself into trouble.
I tried 8.5 grains of 2400 today behind a 240SMK. I got exactly what I was looking for. Low of 997 fps and a high of 1051 fps. All the rounds cycled my AR and would lock it open on an empty mag as well. I think I've found my subsonic load.
Thanks for the help.
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