223 subsonic

[mtbraun]

Looking for a starting point on working up a subsonic .223 load for an AR. Appears to be challenges with a small bullet like this, building enough case pressure, and perhaps also getting rifle to cycle. Obviously hoping to avoid a catastrophic failure with a stuck bullet. I was planning on using a 53 gr. V-Max. Thank you.

 

[Axlrod]

Hodgdon has sub's on their load data site.
55 gr bullet/ 3.1 gr. Tightgroup = 1064 fps

To avoid trouble always start higher with subs, and work your way "down" to subsonic velo. Also shoot paper targets @ 25 yds to make sure bullets are not tumbling, before screwing on your can.

 

[Vern400]

Trail Boss. Fill the case to the neck and shoot it across a Chrony and back off as needed. You might have to drill your gas hole. One way street there. You can probably get 50 gr subs in rimfire. Wonder why the light bullet but don't care. Sounds like fun.