The advantage I find most interesting is that you can use two different adjustable chokes in your over-under. Chokes in the end of the barrel determine how quickly the shot spreads out. So, if you're shooting at a bird that's far away, you will need a tight choke to get enough shot in the bird to bring it down. If you're shooting at one that's closer, you want your shot to spread out enough that it's easier to hit. Do you see where I'm going? You can shoot at a bird with one barrel that has a wider choke, then if you don't hit it and it flies away from you, you have an even better chance following it up with the other barrel if it has a tight choke.
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