I have seen a few versions of a 17 hmr snub revolver, claiming to be a "deep concealment" gun. Everything Ive read tells me a 22 lr is NOT a good choice for self defense, (although many a man has been killed by a 22 lr) and if its all a person could handle its better than nuttin', and bullet placement is everything, but 17 cal defense gun? most of them are 17 grain polymer tipped bullets! My question is are thease really worth the thought? how would they compare to a 22lr?