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Case head separation.
20-25 loads thru a case is pushing it too far imho.
On the old guy thing, yeah lots of us in that boat too!
"Down the floor, out the door, Go Brandon Go!!!!!"
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BR,
Those photos are classic case head separation. There will be a visible score mark on the chamber wall where the split concentrated all the hot gasses as it came apart. It won't affect accuracy.
Even though you are bumping the cases the bare minimum, all cases fail eventually. Seems 25-30 reloads for that brand of brass, powder, dies and loads is the max.
I would ditch the lot and buy new brass. That split was a warning. Do not use the rest of them, even one more time. If you have any loaded, pull them apart. Firing them they will be a gamble that you get the same again or worse. A bolt in your face or lose your eyesight. It's not worth it.
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Klem, I know you are right and thank you for the concern and help.