I think the problem is the belling, also.
You shouldn't have to bell case mouths for jacketed bullets at all. Just the slight curve at the bottom of the jaket (or a boattail) and a light chamfering of the case is plenty.
I'd bet that you are catching the bell on the lip of the seater die. I've done it hundreds of times if I bell case mouths too much (when loading cast bullets).
Simply stop belling and I bet the problem disappears.
I do have to ask, though: is that 24.9 a START load for that bullet? If it is, and it fills the case almost to the mouth, then how would you work up? If it's NOT a start load, then why in heck are you starting there?
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