My Parker 16 GA Trojan, #1 Frame, Manuf: 1921, has 2 1/2" chambers. Since I'm not a reloader yet, does anyone know where I can purchase some 2 1/2" cartridges? I also have a G Parker 16 GA with Damascus barrels that has 2 1/2" chambers, would love to know where I can purchase some appropriate low pressure rounds for it. Thanks