S&W barrels were always a crush fit, the pin did not actually hold the barrel unless the barrel was not properly torqued into the frame. Barrels with a choke were more a function of a barrel that was not fitted quite right and it required extra torque to get the front sight into the 12 o'clock position.
Amazing how many people do not understand that. Anybody who has fit barrels knows this. They think the pin does some magical work. All smith barrels are fit to 1/8 turn or so from top dead center then torqued to 12 o’clock pinned or not.
