I use a 1300 with the factory full choke and most loads that I've tried pattern well to 30 yds. and some are good to 35. If you want to go past 35 you will probably do better with a turkey choke. I use Fed. #4 3" Flite control lead and the 35 yd. pattern looks good. At 40 it is unacceptable. The same brand in #6 shot does pattern acceptably to 40, but I've been led to believe that lead 6 shot carries enough less energy at 40 yds to make a difference. None of this matters a lot because the 3 turkeys taken by this gun have been at 19, 23 and 21 yards. Have fun experimenting!