Beside this: Have you tried this? You can do a lot of things with one that you can't do with the other. [ame="http://www.youtube.com/watch?v=7isS5k99QIg&feature=youtu.be"]http://www.youtube.com/watch?v=7isS5k99QIg&feature=youtu.be[/ame]
For what "Bob" costs, one could hire one of those fellows who stand in front of the paycheque loan shark's office holding a "get free money" placard a couple of times a week to act as a human punching bag. I'm certain they'd appreciate the variety in work and you'd finally be able to test your power shots.