RE: 24INCH BARREL, ANY GOOD FOR DOVES EXT.
The "best all around" barrel is the one you are used to shooting and more importantly, the one affixed to a gun that fits you properly and that you shoot well. If you are used to looking down a 28" pipe, than stick with 28". If you did well with a 24", than by all means...
The velocity difference in a 24 and a 28 is slight, but for practical purposes negligable. If you like the gun, then go get her!