Honestly? With a good choke I probably would. Have had some 870s, 500s and a Stoeger Condor with Mod chokes that make it a high hit probability at 30 yards. Can't say I've ever been intimidated by 12 ga buckshot. Definitely find 8 and 9 pellet pattern better than 12 though, in that order.
A fella could also get some reduced recoil loads that penentrate 16" thick animals just fine too lol. We can throw rocks 30 yards.
How did you prove the 22 is "vastly superior" to 9mm? I think I missed it. The pictures of hardly expanded .22 cal bullets were nice though.