Lucky you to get to skinny down the herd. If your gun is a full chock change to 1buck and atleast doulble that range and take time to pattern and maybe add another 65 to that 15. or more with good sites added . If the gun is a cyclinder bore ,,,forget what i said about 1 buck but there are some control wade buck loads out now that should still exstend range some also try 0 if cyclinder bore. Grewup buckshot hunting and killed alot of deer well beyound ,a, what most people will believe if i say it so try if you can. Most guns DO favor one brand and lenght over others. Never seen one throw 3 1/2" worth while, always 3" or even 2 2/3". Bet your eat'n deer all year. Lucky you