I have done this about 3 times with one instance ending up in a double feed. User operation error yes, know your airgun, but for some reason its more likely with this RTI Prophet. Sometimes when I think the cocking lever is all the way forward and locked, it is not. The RTI will still fire when the lever is not fully forward which pops the lever back and not enough pressure to send the pellet or slug down range. I have not owned a lot of PCP's yet, but wonder if the 'lock-up' happens earlier in others compared to the Prophet? Maybe its Just Me. 
