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I agree with the aboves & a quick way to diagnose is to check you bullet tension right after seating (to see if it's being held firmly by just the neck tension) & then do your normal crimp operation & check again.
If you're doing the seat/crimp in one operation, start over. Unscrew your seater plug all the way. Screw down your crimp till it just touches the case & then back it off 1/4 turn or so. Lock that down & then reset your seater plug.
Try that to see if the problem goes away. You'll still have to crimp though, but that's for after finding out what's wrong.
If this doesn't fix it, you've a big discrepancy between expander plug & bullet diameter.
Need to get this sorted out or you're wasting time making junk.
Although not a fix, but wondering if one of those full-length factory dies would squeeze these into some shape? Just curious as I've never used 'em & hmmmm re to what extent they'll "make things better ...."
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