For 20s the longer the barrels the higher the premium. An appraiser has stated that he uses a 50% premium for 30" and 100% premium for 32" on 20 gauges. I think 26" and 28" are a pretty mute point from what I have seen, with the 28" probably bringing a small premium.
For 28 gauge you really pay a premium for 30" and super premium if you could find a 32" 28 gauge. For 26" and 28" again I think it isn't that much of a difference.
Of course one would have to assume the same grade/condition of gun when making comparisons.
I can't speak for the .410 bore as I have never really been interested in them.
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