RE: Shotgun barrel length?
My bet, is if you have the Win choke, you probably have a 28-30" pipe. My money's on 28". To find the length, measure from the tip of the muzzle, (Front of the barrel) to the breech. (The back of the barrel. Guestimate where the shell fit's in, and measure from there. Or just ahead of the ejection port) As was said above, your powder is burned up in a fairly short distance. I was always led to belive it was 18", but I could be wrong. My personal hunting gun sports a 20" barrel, with chokes. The biggest misconception is folks figure if you have a longer barrel, you'll get more reach. In reality, if you have a 28", you'll get 8 inches more reach than me. I like the shorter barrels myself, because I use the one gun to hunt pheasant, grouse, ducks, etc. Sometimes in thick cover, or sometimes on the baldassed prairie. The short overall length makes it a fast pointing, good handling gun, especially in the thick stuff. Good hunting.