I am not saying don't do it, I am just saying it will not be without difficulty and proceed with caution.
Getting the Grendel subsonic is easy enough if you use a high bulk powder like Trail Boss. Say, a 160gn Sierra loaded to 2.165" and 8gns of Trail Boss should do it. That load fills 88% of the available space which makes it theoretically safe. It won't cycle the AR though.
Filling the case to 80%, cycling reliably while subsonic is the Holy Grail.
Getting the Grendel subsonic is easy enough if you use a high bulk powder like Trail Boss. Say, a 160gn Sierra loaded to 2.165" and 8gns of Trail Boss should do it. That load fills 88% of the available space which makes it theoretically safe. It won't cycle the AR though.
Filling the case to 80%, cycling reliably while subsonic is the Holy Grail.
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