I've gone through 22, 26, 28 and 30" barrels on a dove gun, and settled on the 26 merely for balance. Given the same choke there's not much difference in pattern that I've noticed, though I'm sure there is a velocity advantage to the longer barrels; I'm not sure how much of a difference it would make. My advice would be to pick the one that feels the most balanced and swings/mounts the best for you.
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