This video from is from the good guys over at Taofledermaus, Really interesting results from shooting a diabolo pellet backwards from a smooth bore! Now I don't have a smooth bore PCP but one of you guys sure do. interested to hear the results.
https://www.youtube.com/watch?v=33-RnJekpLU
https://www.youtube.com/watch?v=33-RnJekpLU