B2,
Imagine you plan to hunt with your hammergun. If so, issue becomes whether you have a safety so you can carry your gun cocked while in the field. (All of the hammerless guns are cocked once you close the barrels.) Hammer guns with safeties are rare although more common among the modern guns.
The alternative is to choose your hammer gun so that you can sweep the uncocked hammers back with your thumb as the covey rises. Such a vintage gun is easier to find than is one with a safety, but you would need to check it out yourself. Some argue for keeping the action open and then closing it at a covey rise. Can't imagine walking around with the action open myself and, besides, some hammer guns will not open/close with the right hammer cocked!
Bottom line, buy a modern hammer gun that has a safety.
Regards, Tim
