My advice is to locate a few Gun Catalog reprints from the period of time you want the Shotgun and Cartridges from and perhaps books about shotgunning from that time period.

You can even find them online.

Find the type of gun that fits your story and that will drive your cartridge selection etc.

Last edited by postoak; 07/06/12 01:43 PM.
Mine's a tale that can't be told, my freedom I hold dear.