It's hard to believe all five chambers are so rough as to make extraction that difficult. I suppose the extractor star could be misaligned and make extraction difficult, but that should be apparent.
It sounds like a residue problem or an ammo issue. As mentioned, the 460 operates at pressures far higher than most other revolver cartridges and therefore can have some additional issues. Before calling S&W I would clean the cylinder thoroughly and try some different 460 factory ammo (preferably a different brand). If the difficult extraction persists, I would take it up with S&W.
It sounds like a residue problem or an ammo issue. As mentioned, the 460 operates at pressures far higher than most other revolver cartridges and therefore can have some additional issues. Before calling S&W I would clean the cylinder thoroughly and try some different 460 factory ammo (preferably a different brand). If the difficult extraction persists, I would take it up with S&W.