1 A shotgun does not "shoot to point of aim" ,it shoots where it is pointed.
2 Shotgun barrels are not "regulated" exept in the sense of being bored to throw a consistant pattern with a specific cartridge at a specific distance .
3 This obbsession with multi choke is yet another fad aimed at people that think lots of add ons will make them in to some kind of super shot.

But thats MY opinion