I'm no expert on the subject since I haven't actually hunted with any buckshot loads yet (I'm guessing I won't be an expert then either) but I have shot several rounds through mine. Buy a couple different boxes of #4 buck and try each through the different chokes you have available to see which yields the most consistent pattern. Of the shells I've shot, they seemed to perform the best out of my factory full choke and my turkey choke was a close runner up. Cheap Remingtons held a tight enough pattern for a lethal shot at 50y for me out of my Mossberg. (I was shooting 3" shells though)

You'll just need to experiment to see what combo gives you the tightest pattern

rw