Rio Ammunition STT28LT8: For all shooters who want to sharpen their edge, the RIO Star Team Evo Training cartridge is the best option. A very economical and efficient training cartridge which will get you ready for the big event. RIO 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.