Pack them up and send them back to Remington. A) if it is their problem they need to know, and B) they are the experts.
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Pack them up and send them back to Remington. A) if it is their problem they need to know, and B) they are the experts.
What Winger-Ed said. I had some new .30 Rem rimless brass I was neck expanding to .32 Rem. On firing the necks split. Annealed the rest of the batch, 90 new brass mind you, to solve the problem.
As the OP hasn't made a comment since starting the thread I'm inclined to believe a mistake was made. And not by the ammunition manufacturer.
I had one 30/30 case split out of a run of 100, as a result I've annealed all my 30/30 brass that doesn't have primers in, some of these cases are decades old and this will be their first annealing. I'm also annealing the 150 W-W new unprimed brass I have and will be doing the same to my 308 brass just so I'm happy that's one potential failure cause nipped in the bud.
Before I did it I polished the manky cases with 0000 steel wool so I could see the discoloration forming.
Attachment 325734
picture of the neck splitting
consistent on about 50% of the rounds fired
atr
Try another brand to isolate the answer. If it splits also, that gun has a problem.
But it looks like bad brass to me.
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Now that you have posted a pic, I tend to agree with the bad brass diagnosis, especially since no obvious swelling seems apparent.
When I fire form my 30-30 Ackley improved that portion of the shoulder gets blown out to 40 degrees and the neck moves up about 1/4 inch. I might have a few cases out of 100 split but if you are getting 50% splits with a minimal change of shape it is the brass.
Attachment 325735
Old or BAD brass! Neck is filthy. IF purchased lately send to Rem, otherwise, just toss the cases. Annealing probably won't fix.
Those Federal .303's I mentioned looked exactly like that. Bad brass.