Shotgun Headspace off?

[One Shot One Kill]

Asking, because a little Google-fu says this rim bulge and hulls ripped from rims (issue im having) can also be caused by this.

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[AmmoManAaron]

What gun? Factory ammo or reloads?

 

[One Shot One Kill]

It's a leader ar-12 (Mka 1919 copy) auto loader, the ammo is factory AA target loads. Functions fine with these smooth shells, but some ribbed 12g get the rims ripped off.

I had a thread on this gun, I need to update it, because I would stay away from these, new on the market and untested trash apparently. Shame because the gun is a blast to shoot.

 

[sloughfoot]

It sure looks like excessive headspace.

 

[AmmoManAaron]

I would say it's definitely the gun. Could be excessive headspace or an issue that gives the appearance of excessive headspace (action not fully locking up, but close enough that it still fires). On your spent hull, I see what appears to be a fairly hefty ejector mark near the "HS" marking - could be an indication of high bolt speed which could mean that the bolt is not locking up properly.

 

[One Shot One Kill]

Dang, so either way this looks like an issue the manufacturer will have to fix.. thanks for the input guys! Looks like I'll be calling them.

 

[One Shot One Kill]

Well the importer is sending a new locking block for the bolt... No idea if this will fix the problem but I'm hoping so. I'm pretty much clueless when it comes to the workings of a gas operated shotgun.

 

[One Shot One Kill]

Noticed today too that when locked in with the block, the bolt will still move 2-3mm back and forth from the chamber. Not sure if this is the problem.