#1 Get a 3.5 inch 12 gauge magnum shotgun
#2 Load it with Hevi-shot ammo
For a choke tube, I have no hard and easy answer. What may work good in one gun, may not in another. You may need to experiment with a couple of chokes before finding one that will give you good patterns.
Definitely avoid getting a ported choked tube. They are horribly loud, and bad for your hearing.
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