Trisseh
Duck-duck-chicken!
I concur with the best method being cervical dislocation. I’ve used it successfully on multiple birds of multiple sizes and ages and it is by far the better option for you. I’ll never forget the story that my mom had from when she was young. She was hunting for ruffed grouse (partridge) and the bird she found took 16 pellets before it died. The first pellet knocked it out of the tree and then the others were at much closer range. I would not advocate for using a BB gun on any bird unless it was truly the only option, which it never would be as all you need for CD is your 2 hands. Even if you don’t get it completely perfect the first jerk, the bird is unconscious for the second. There’s a reason there are only 2 acceptable methods (at least here in Canada) for slaughter of conscious birds, being cervical dislocation or decapitation. 
