I saw that you have a 16ga. Is it an older gun? Have you shot it before?
Check the choke on your gun. If it has a fixed (can't change it) choke, you'll need to check what the choke is. A full choke will do, but anything wider will limit your range. Having the right tool for the job is important.
Without going too far off topic, you'll want to make sure you can get 16ga shells up to the task. 16ga shells are often hard to find these days, and 16ga turkey loads may be even harder.