Announcement of the 400AR was first posted on March 9, 2016. For the latest discussion, check out the article at The Firearm Blog: http://www.thefirearmblog.com/blog/2017/06/08/400ar-another-wildcat-cartridge-ar-15/


11 thoughts on “400AR

      1. If you’re married to the Russian case, you might look into the 9×39.
        The 7.62×39 was dismissed early on in the development of the 400AR, because it is too tapered at the web and too short for maximum powder capacity. The 400AR produces the most muzzle power possible from a double-stack AR-15 cartridge.


  1. It would be interesting to see how the 10 Auto 115grs Extreme Defender bullet from Lehigh would perform loaded in the 400AR.
    It’s solid, rated for velocities up to 4k fps, so that should not be an issue.


  2. Is it possible to purchase an upper and BCG or possibly send a barrel and have it reamed?
    I am very eager to get my hands on this caliber and put it through the paces hunting.


    1. The above article reads, “maximum allowable chamber pressure of the proposed AR wildcat would be around 50,000 PSI” which became the 400AR standard. Specific loads are undisclosed.


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