I am wondering.
Where did the cartridge get loaded in the chamber and stuck?
The only place a live cartridge should be loaded into a chamber is where it can be legally and safely shot. If this happened at the range, why didn't you shoot it right there?
Did you bring it home that way?
I'll guess you were loading shells and wanted to see if they would go into your chamber, so you loaded the cartridge in the rifle in your house, or at your loading area. (OK, I'm just guessing at that.)
It is now written out in plain English that a firearm should only be loaded at the place where it will be shot.
I would not have asked on a public net, how to get a live cartridge out of my rifle!