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Message: <blockquote data-quote="TeamTomlyn" data-source="post: 3919341" data-attributes="member: 46099"><p>The base of the cartridge (not the rim) did not get resized. 223/556 is notorious for it. That last little bit of case at the base is too fat for the chamber and is getting stuck. This same issue can cause some out of battery issues if it gets too far backed off. You literally need as much of the case as you can get in your sizing die as possible. Screw your sizing die down until it is in contact with your case holder. Look out for slop in your press that might be cheating you out of .001". I highly recommend an ammo checker to avoid this issue.</p></blockquote><p></p>