The Remington 220gr Subsonic in 300 AAC BLACKOUT is probably the most popular factory-loaded subsonic rifle round available. Though its power is the rough equivalent of a hot 45ACP load, the Sierra Match King bullet is pointed and streamlined. This load is tested against a panel of IIIA body armer to see if the bullet shape makes the difference.
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To learn more about the Remington 220gr Subsonic for 300 BLK: http://www.remington.com/products/ammunition/centerfire/300-aac-blackout/300-aac-blackout.aspx