As always during my indoor Sea Can Field Test Shooting videos, I first test out the velocity of each gun. Since the Umarex SA10 CO2 Blowback Pellet and BB Pistol can shoot both 4.5mm Steel BB's and .177 caliber pellets I tested both ammo types using my Chrony Chronograph. I fired three shots of each ammo to get an average fps velocity. Interestingly the heavier 6.9 grain lead pellets had the higher average velocity of 376 fps versus 304 fps with 5.1 grain Steel BB's. I have a feeling the lead pellets fit the barrel more snug and did not let any of the CO2 blow by creating more back pressure and a higher velocity. Read full article here: https://www.replicaairguns.com/2018/3/3/umarex-sa10-co2-blowback-pellet-and-bb-pistol-field-test-review