Shoot it at a turkey target (make some cheap ones with some white copy paper and trace with a sharpie around your right or left arm and hand) for a pretty close to scale turkey head. Go to the range and shoot them at 5,10,20 and 30 yards and see how it patterns before buying a choke. Ideally, you can find a load or two that keeps a nice even pattern. It takes just one pellet to break the skull and neck of a gobbler but if you can get several in that area its good for turkey's. You can go all out with this stuff and that's fine too but if you're trying to use what you have. Try some different loads first. A general rule of thumb is larger shot sizes will like more open constrictions (chokes) than smaller shot sizes. But also, small shot means more shot per shell so there is a balancing act to all of this. And now with all of the other materials going into making shot (ie. tungsten, bismuth, etc.) which are heavier or as heavy as lead you have some other options but oftentimes these shells cost more. I'm cheap and old school but lead in 6's or lower are fine for turkeys. My favorite load is the old Active #5's for my Ithaca Model 37 Turkeyslayer. It has a .670 choke constriction and patterns well with these loads out to 35 yards. I had a good guy on this forum that sent two boxes of them for free last year. He just was getting rid of them and had a place to send them which I was grateful. Anyway, I pretty much just bowhunt for turkeys now but have a lot of fun turkey hunting over the years.