I have not checked that yet. This gun is basically new and probably had 2 or three boxes of ammo through it. All other ammo fires fine. Had I not picked up my shells (I always do) I would never had noticed this issue.Have you checked your shotgun's headspace and the bolt's locking lug? If headspace is too long, or if the bolt's locking lug or the receiver is worn, the pressure will push the bolt back a bit, causing the plastic to stretch, but the brass will tear like that.
The other shells look good. I fired off an email to Federal but I'm sure it won't do any good due to the age.I'd be curious to know how long the unfired shells are. *Assuming* the chamber and bolt are within spec, a shell that's too short, or a rim that's too narrow could also cause this.
Even if the other brands of fired shells don't have torn rims, do any of them show even slight fatigue in the same area?
Do the fired primers have any signs of over-pressure?
It depends on, well, how plastic the plastic is. Some shells will be more ironed-out, others not. Age can play a part in that, too.I'm no savant but shouldn't that crimp be more ironed out/more flat? Maybe the plastic hull has age hardened and not opening how it should.
How do you know about Floyds? Actually I do have a few more 12 gages but their not pumps. I'll give it a try. ThanksDo you have another shotgun to fire these shells from? If the same thing happens, then it's the shells, and I wouldn't worry about it.
If you're a belt-and-suspenders person, you might take your shotgun over to Floyd's (2917 E 2nd) and see if he can check the headspace for you.