carslon chokes http://www.choketube.com as a dead coyote choke that is made for T shot and buck shot. I use win. 3" 00 buck with this choke and my nova and it throws a great out to the 50-60 yard mark ( 12 pellets in the shell, 6 pellets on a 8x10 target at 60 yards). At 25 yards, its about a 6 inch group. (all 12 pellets.)
hope this helps
novaking