I have been told and read many times that it takes 24" to get a complete burn of the pwoder charge in a 12ga. I don't know this for sure, as I have no way of independently testing this, but I trust the sources that I have read and who told me.

I personally like a 26" barrel. For me it seems to be a good all around, do everything barrel length. I use a 26" barrel for deer, crows, rabbits, dove, and turkey. One advantage that a longer barrel has, is a longer sight radius, which may make shooting with a bead sight a littel more accurate, but that's debateable. As for the choke, you should have a Imp Cyl, Mod, and Full, that comes the gun. Most Full chokes should be about .690" ID or so. For a turkey choke, I would recommend something around the .665" ID. IMO this ID Choke give the best patterns with #6, #5, and #4 shot, from what I have seen. I don't see any need for a .640" ID choke, and I have not seen many that shot that great anyway. If Benelli does not have turkey chokes avalaible, there are several good chokes on the market by Hastings, Briley, Colonial, and Carlson, and any of them would do you a good job. You could get the flush kind, the extended kind, or the extended & ported kind.