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I would check your firing pin hole and make sure it's the tolerances are tight enough.
Looks like super soft primers combined with a loose firing pin hole.
I have done that to more than a few 6.5x47L primers with hot but not max loads and soft primers.
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Look at second case down on the right. Looks like a raised ring around the firing pin hole?
If it is, that's the primer flowing back around the firing pin and if it goes a tiny bit further it's going to blast that little metal disc of primer back into your action somewhere.
Did you leave any of this ammo in the sun?
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