RE: 24INCH BARREL, ANY GOOD FOR DOVES EXT.
I'm gonna go out on a limb an say.....Buy what feels best to you. I personally have a few shotguns (all Benellis) that I will shoot against almost anyone, whether sporting clays, trap, actual game, etc, and outshoot most anyone. I have 24" barrels on all my 12 gauges (M1 Super 90 and M2) and I do have one 26" barrel on my Benelli Montefeltro.
If it fits you, get it. Shoot it, and enjoy it. In the current production loads, the powder is all burned in 18", and if you have good form and follow thru, barrel length will not affect you in one bit.