I definatly would not use the guy who uses a high powered shock collar.
You don't need anything more than the normal shock collar, set up properly they just get the dogs attention. According to my unit, start at the lowest setting and slightly increase the setting until the dogs ears react. My unit has 2 buttons, a very slight zap and a longer duration zap, all I have ever used is the lower setting unless the dog is really acting up. Have not even put the collars on in a very long time, all I have to do is show them the collar and they instantly start to listen to Us.
I agree there probably are better ways to train the dog, but with the rattlers I would not want to have to do it over and over and over.
Good luck with catching a rattler and training your dog :E