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If you still need info go to accuratepowder site and work your way to the .223 listings and subsonic load data is at the very bottom. Keep in mind they have been trying this since mac cans came out and they were putting them on the m16s. Basically they found a subsonic round will not cycle the action but you can shoot them single shot. Most can warranties are voided by shooting 223 subsonic but I think that Engles ballistic research stuff is suppose to be ok in factory cans. Hope this helps.
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