If you get on shotgun world there are some pretty rigid opinions on both sides of the issue (thread started about choke tubes then morphed on page two):
http://www.shotgunworld.com/bbs/view...99564&start=20
Personally, once the chamber and forcing cone are GTG, I wouldn't spend the money. I have a phletora of Remington shotguns and barrels, as well as several Brownings, which have polished vs. chrome bores. They generally get cleaned once a year with no rusting, etc.
Our high-use range shotguns (primarily 870's) would get a couple thousand rounds a year through them, get lightly cleaned once each range week, and detail cleaned once (at the most twice) a year. Original barrels on all of them unless replaced for a tacticool reason.
Primarily, hard chroming reduces wear and is corrosion resistant. The first duty revolver I purchased was a Model 28 Highway Patrolman. I sent it off and had it hard chromed when I had 'L-tronic Night Sights' installed. Very durable finish. I loaned it to my son for a backup gun when he went on a boar hunt. Things happened and a couple years later when I said 'say, you planning on giving that back?' a frantic search ensued for the revolver. It was in a cardboard box, in his basement. The gun was filthy. At some point the box had got wet and there were two spots of rust on the cylinder. Not bad for a couple years of neglect. BTW it still looks badass.
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