You don't describe just how far the failed rounds go in. However, it sounds like you may have a bit of a bulge (large diameter) in the middle of the case.
The Lee tool the prior poster mentions sounds like it will fix that problem. I think Lee also makes a crimp tool that does the same thing - in fact it may be what the gentlemen above me is talking about.
I'd measure the diameter of the cartridge in two or three more places before buying anything.
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