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Beiruty, I saw this earlier today, although I haven’t watched the whole thing. Has to do with head spacing issues in a Sig M400 due to heat buildup. It might be worth watching.

https://youtu.be/l_W3sXQYxkc

Beiruty wrote: ↑Sun Apr 14, 2019 9:41 am

kayt00 wrote: ↑Sun Apr 14, 2019 8:51 am

Beiruty wrote: ↑Sat Apr 13, 2019 9:46 pm Update:
Use science, a few sec of super chilled compressed "air in a can", sprayed on the case head, made the mission way easier. One bang and it just came out.
Photos:
https://photos.app.goo.gl/8uKwduy1N7Wop ... 13OHfLBs5o
Chamber was polished too, too much black stuff came out
Photos:
https://photos.app.goo.gl/Z83ZGuc72GQoV ... 90NDHJhJJ0

Because science, glad that worked out. Any idea what caused the problem?

This is why it did not chamber:
https://photos.app.goo.gl/YBMcuyALqRo5XbJJ7

Wow! That bulge on the shoulder is alarming. Did you give the chamber a good cleaning? Also, any ideas of what caused the bulge? It might be useful to examine the next couple of dozen ejected cases to see if there’s any incipient signs of any problems

Beiruty wrote: ↑Thu Apr 11, 2019 12:20 am

The Annoyed Man wrote: ↑Wed Apr 10, 2019 9:21 pm It looks from your pictures as though the stuck round wasn’t fully seated to begin with.it may well be that the previous round left a piece of brass stuck in the chamber.

This is what I expect to find out soon. The 24" brass rod was not delivered yet. I suspected that the case neck was split and stayed in the chamber when the next round entered the chamber.

Beiruty, you might want to consider pulling the barrel off of the receiver if tapping on it with the brass rod with medium force doesn’t do it. Depending on how you have the upper clamped in a vise, if you have to start banging too hard on the stuck case with that rod, it could potentially damage the receiver. Removing the barrel, or at least clamping the barrel in the vise rather than using a receiver block to fix the upper in place while beating on the rod, would eliminate the possibility of receiver damage.

I'd be very careful about the use of heat on the barrel anywhere near the receiver extension. Another thought... if the bullet is already set back all the way into the case, maybe you could use a cleaning rod to keep the bullet pushed back while you dump any remaining powder charge out the front of the barrel. That way, if the primer does detonate, you’ll lessen the risks of bad juju.

Anyway, good luck with it, and let us know the final outcome.

It looks from your pictures as though the stuck round wasn’t fully seated to begin with.it may well be that the previous round left a piece of brass stuck in the chamber.