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I've got a 9" AAC 300BLK with a SDN-6 for my "house gun" as well. I run 125gr ballistic tip supersonic ammo through it for the same reasons mentioned above.
-Supersonic loads have much more power, and will reliably expand. Mitigates concern for over penetration.
-Subsonic is super quiet, but the super stuff is not painful to shoot indoors without ear-pro.
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