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It’s once fired older brass. I have different brand older ones that are all domed like that. I didn’t reload until a few years ago so not familiar with it. My normal WLR primers don’t seat into them.
I just put a new uniformer on my Lyman case prep xpress, it’s a lot of material and I’ve not been able to even get one cut down to fit a primer.
I've been shooting Federal 308 brass since the 1970's. It has varied in weights over the years and the old brass was quite soft. Having said that, I've NEVER had FC 308 brass not accept a L/R primer. I've used every brand of primers including the Wolf Russian primers that are a bit bigger than the U S primers. I use them when pockets get a little stretched.
The only time primers don't want to fit is because of a crimped in primer. I do use a RCBS primer pocket uniformer on some of my precision loads with FC brass. A primer pocket uniformer only squares the bottom of the primer pocket. It does not make the primer pocket bigger.
Your brass does not look to be primer crimped. And the domed shape at the bottom of the primer pocket can vary from mfg. to mfg. I've had some U S M-80 brass with very domed pockets, but it didn't affect the primer seating or firing of the Cartridge.
You have something else going on here if you can't seat a Winchester L/R primer.
The only time primers don't want to fit is because of a crimped in primer. I do use a RCBS primer pocket uniformer on some of my precision loads with FC brass. A primer pocket uniformer only squares the bottom of the primer pocket. It does not make the primer pocket bigger.
Your brass does not look to be primer crimped. And the domed shape at the bottom of the primer pocket can vary from mfg. to mfg. I've had some U S M-80 brass with very domed pockets, but it didn't affect the primer seating or firing of the Cartridge.
You have something else going on here if you can't seat a Winchester L/R primer.
Alright, I suppose I’ll just sit them aside. Was just looking through old stash anyways.
Is it possible the expander bottomed out and damaged the brass and flash hole. It looks like cracks around an over sized flash hole that appears to be dimpled into the primer pocket.
It sure looks like it did....
Nothing has been done to the one with the dome primer besides tumbling. It’s just old factory loaded ammo. My dad doesn’t reload but saves the spent brass and it was some he had for decades. I have Winchester brass the same way.
I take that back. I used a new Lee full sizer on them. Out of curiosity I went back and tested a universal decapper and then the fl sizer. The new fl sizer is causing the issue, I was able to replicate it. Thanks!
^^ Yup, that is it. ^^, that's the "something else going on". I had to go back and zoom in on the case photos and on the second case I can now see the pocket is convex from something pushing down from inside. supercorndogs caught it.
I'd take the decapping rod out of the die and check to see if it got bent. Lee rods are pretty stout. Other dies have thinner rods and can get bent with that force of bottoming out on the case head. If it did get bent, Lee replacement rods are cheap. They come in caliber sizes because the neck expander is machined into the rod.
Midway has them on sale. https://www.midwayusa.com/product/1012847262
I'd take the decapping rod out of the die and check to see if it got bent. Lee rods are pretty stout. Other dies have thinner rods and can get bent with that force of bottoming out on the case head. If it did get bent, Lee replacement rods are cheap. They come in caliber sizes because the neck expander is machined into the rod.
Midway has them on sale. https://www.midwayusa.com/product/1012847262
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Thanks! I have that issue in a some cases and now I know what causes it. Excellent!
