STAR TEAM EVO TARGETCARTRIDGESFor all shooters who want to sharpen their edge, the RIO Star Team Evo Target cartridge is the best option. A very economical and efficient training cartridge which will get you ready for the big event.\nRIO is obsessed with delivering only the best sports shooting cartridge for use by our fans worldwide, including our RIO Pro Staff. This obsession has lead to countless wins, including US and international Championships and even Olympic Medals.\nCaliber 12 GaugeChamber 2-3/4\