Cases are buldging on my 280AI, usually starting out on only one side of the brass. Trying to figure out if its a saftey concern or not. Ive only fireformed and neck sized, total of 3-4 fireing. Barrel is headspaced to .004 crush fit.


Brass is undersized, and chamber is at the high end of tolerance. Sure looks like case head separation, but seems so unlikely due to the ackley design and neck sizing only.

Is my chamber out of round? this gun is extreamly accurate 1/2 moa 5 shots all day.
I asked mcgowan about it, and they said to send it back to them- which i really do not want to do if its something as simple as brass being undersized, or the extractor/ejector holding the case to one side of the chamber durring fireforming.

Has anybody had a similar issue and got to the bottom of it?