spaniel
I would think it fair that a SST/SW, Barnes, etc may shed some weight but is not DESIGNED to fragment.
Two things - I think the Nosler should be listed right in their also because the nose lead is not protected (not bonded to the copper) and is basically used to start the mushrooming process.
This is the best definition we have heard so far - of those bullets and I would even go so far as to say any normally accepted American Big Game hunting bullet.
Any bullet will fragment if you shoot it fast enough.
I would also second this thought into a difficult medium while it has sufficient energy...