Honestly, you are gona have to try a variety of loads, and pick the best one. Get some large pieces of paper, or cardboard and pattern it. But I'm gona bet the pattern runs out at 30yds, full choke don't always pattern full choke. But I have seen a few that did a little bit better than full, but not much. 70% of the load in a 30" at 40yds is what you are after. Anything better and you are golden!