A lot of these CO2/pump and PCP guns are tunable. From the box a gun might shoot 25 to 35 rounds at 850fps. Increase the airflow and it may fire 10 to 15 rounds at 1050 fps. That XS60C at Flying Dragon Airguns is such a gun people like to full with. It comes in .177,.22, and soon in .25 I think. It is a single shot like the Disco(Benjamin Discovery) but cost less. Mike offers the rifle & pump combo for $305. Be safe.