choke or no choke

[tjwatty]

I can't say I've ever shot a load of any size buck shot in my life but I can't imagine the range being much past the effective range of a shotgun slug. (the boys will correct me there I'm sure) With that said, what difference would the choke make on the pattern? If muzzel velocity is equal, why would the shot travel any further? Maybe being in a tighter pattern would give it some but I can't imagine it being much.
Gets me back to my pet peeve, 10ga. shooters that think they shoot farther. (sorry 10ga owners)