A better approach to brass recycling - reload the 9mm brass, and swage .22 centerfire bullets out of the .22LR brass (http://www.corbins.com/jackets.htm#rfjm
). Both of those projects will work out a lot better than shooting that brass out of a shotgun... for the reasons explained by previous posters.
Mindset - Skillset - Toolset. In that order!
Attitude and skill will get you through times of no gear, better than gear will get you through times of no attitude and no skill.