I've received several boxes of old shotgun ammo which doesn't seem to fit neatly into the bore of my shotgun - new ammo fits fine. It seems like near the head of the shell, the shot has bunched up and warped the case. It's harder to see in the first picture, but it's obvious in the second one:


Is there anything I can do to try and massage these shells back into shape, or am I better off just safely disposing of them?