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You have an issue, but it sounds like it's bigger than ammunition. Because the SPC has a rebated rim, it is headspacing on the shoulder. If you've never had problems with your .223, then it's an issue with that particular barrel/cartridge. Your chamber may be a bit on the long side, but still within specs. Have a 'smith do a chamber cast to check it out, but you might have to reload to get consistency. You can try other ammo manufacturers, and it may go away. My suggestion would be Hornady ammo. If that don't work, then you'll need to consult with your local gun guru. Good luck.
gd
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