18.13,
Yep, no surprise there. 1250 fps on a cleaning pellet that absorbed oil (now 1.8g) is 6.25 fpe. That's like 50% more energy than a 10M pistol shooting 7.8g pellets at 500 fps (4.3 fpe).
And I'm guessing with a handle like that you are shooting .22 cleaning pellets so even more energy.