...In Missouri, we can use a .410 for turkeys.
In '07, my 8-year old granddaughter killed a 20 1/2 lb. gobbler with a 11 1/4" beard, at 22 steps with a Contender .410 (21" barrel). It belongs to a friend, and I have it borrowed again this year to take my other 8 year old granddaughter on the youth hunt. The older sister that scored in '07, is now almost 13, and too cool to go turkey hunting.(LOL)
Anyhow, within its confines, the .410 will kill a turkey. A range of approx. 20 yards, no brush, etc., is what I consider the limits of this shotgun.