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The diameter of the neck of a round with bullet seated is larger than the diameter of the neck sizing portion of the FL die.
The leverage of the press forced the cartridge into the reduced diameter portion of the die. So its stuck. Stuck tight enough that the shellholdr ripped through the rim. Might or might be possible to tap out. Catch is that a live round is stuck in what is essentially a really short barrel. That is why there is a safety issue.
So drill through the friggin bullet already, do it it a bucket of water to keep it cool, there won't be any heat or sparks to set it off. Dump the powder out, punch the bullet back into the case, the neck will then be free to compress (which will release the dies hold on the neck) then punch the whole thing out, it'll be free with little force. The whole problem is that the bullet has enlarged the case neck. It ain't rocket science.
Depending on how much of the case is exposed. use a small drill go slow as to not heat up the brass, drill into the case. fill the case up with WD40, cleaner degreaser, or some sort of oil product. should kill the primer and powder at least enough its not going to go kablooie on you.
Then do as the others have said and use a Wooden dowel (or aluminum, brass would work as well) and push the thing out. make sure the rod isn't smaller than the primer opening and you will be right as rain.
Id also not recommended trying to re-size loaded rounds again.
Or use a slightly larger drill bit, and dump the powder out. then you just have the primer to worry about and that can be killed with a light oil.
Then you don't understand the concept of how a sizing die works.The die body forces the inside neck diameter to a size several thousands of an inch smaller than the bullet diameter,and the expander ball expands the inside diameter of the neck to within a couple of thousandths of an inch of the bullet diameter.With a bullet in the case,the die body can't compress the case and bullet,so the assembly becomes tightly wedged in the die.