Does the firing pin make a nice dimple in the primer on both brands? Compare them. If yes then I wouldn't look much further. It's the ammo.
However if both primers look like the dimple is shallow then it could be improper firing pin protusion.
Usually at a range you can find somebody else with a .223 that you could get to test the ammo in another gun. If their gun fires the ammo then you have a FP issue.
If you've had this gun a while and this hasn't happened before then don't waste your time trying to find an answer. It's the ammo
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