No...................Your gun may have bad head space.........Have you tried other ammo to if it still does this? Those half plastic heads may be soft and the problem.

 

Thank you for your guidance. Yes, I tried several different cartridges; they all have some bulging, but one is very slight and another is more pronounced.
Excuse me — could this bulging be because its diameter exactly matches the notch on the bolt head that is meant to pass through the extractor/ejector groove? And since the rear of the cartridge is hollow, might the bolt’s design prevent that area from seating properly?

 

The shotgun is a Browning A5 New Model correct ?

 

Yes.sure

 

Anyone else here on the forum have a Browning A5 New Model to compare the head or a fired ejected shell to ? 12ga I am assuming by the looks of the size.

If no one does Hessam, you could go over to your posting on Shotgun World and ask if someone there has a fired ejected shell to compare against.

 

Yes thank you
I would appreciate it if anyone who knows about this could let me know.

 

IMO it should not be that pronounced. The shells pictured are B&P which are excellent quality!
If there are no other issues with the gun, I personally would not fret and just use it.

 

Thank you very much
The only thing I’m certain about is that the bulge on the shell is exactly the same size and shape as the cutout on the edge of the bolt that slides along the rail.