Doc Holliday Posted January 5, 2023 Share Posted January 5, 2023 (edited) I tried some Hornady Critical Defense 00 Buckshot in my M4 today. I only shot 10 rounds of it, but to my surprise I had 3 or 4 failures to eject. The extractor was slipping off the rim of the shell, leaving it about halfway out of the chamber. I fired 50 or so rounds of Winchester and Federal with no other malfunctions and I’ve never had this happen with any other rounds. Only other malfunctions I’ve had has been low recoil rounds failing to cycle, which isn’t too surprising. My extractor appears undamaged on visual inspection. On close inspection of the Critical Defense shells, the rims appear and feel more rounded and less aggressively angled my other shells, even some old Hornady Superformance shells I have on hand (which have functioned reliably). This leads me to believe that the “smoother” rim is allowing the extractor to slip off the shell as the bolt is driven back by the gas system. Goes to show why it’s so important to function test any new ammo in your firearm before trust it potentially with your life, even if it’s considered premium ammunition. Anyone else experience this with Hornady CD? Edited January 5, 2023 by Doc Holliday Quote Link to comment Share on other sites More sharing options...
xblax619 Posted February 1, 2023 Share Posted February 1, 2023 i ran 2 boxes of that and it ran fine for me. 1 Quote Link to comment Share on other sites More sharing options...
ErnstHatAngst Posted February 2, 2023 Share Posted February 2, 2023 I run the Hornady CD as my home defense ammo. No problem cycling it at all. 1 Quote Link to comment Share on other sites More sharing options...
Nitro Posted July 10, 2023 Share Posted July 10, 2023 So, I'm a little late to this party, but i figured I'd post anyway. Same thing happened to me with this same ammo when I first got my M4 back in 2019, I even posted about it here. I never did really figure out the cause but wasn't really worried since it was only the one type of ammo that did this. I mostly stick to Winchester and Federal these days which hasn't given me a problem. 100% agree with testing your HD ammo first. I had Critical Defense loaded up for almost a month before I realized my M4 doesn't like it very much. Quote Link to comment Share on other sites More sharing options...
jsr1014 Posted July 10, 2023 Share Posted July 10, 2023 I run Hornady Critical defense and I've never had an issue. 1 Quote Link to comment Share on other sites More sharing options...
BigBuckeye Posted February 26 Share Posted February 26 I know this is an old thread but this just happened to me…. My M4 will not extract this ammo Quote Link to comment Share on other sites More sharing options...
Nitro Posted February 27 Share Posted February 27 I was having the same issue for a while. I recently sent my M4 back to Benelli for service and after I got it back I took it to the range to test. I ran multiple boxes of Hornady CD without an issue. Benelli said my extractor/extractor cut was out of spec. My guess is that CD is a little more susceptible to an out of spec extractor. After I starting having this issue with multiple brands of ammo, I contacted Benelli. Quote Link to comment Share on other sites More sharing options...
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