Yes, actually, but only the generally open-minded, non-willfully-ignorant ones. Taking them shooting usually seals the deal, but it starts with making them aware that they haven't thought the issue through from every perspective. I don't consider these folks true, dyed-in-the-wool antis, however--the only thing that ever manages to convince those is actually being powerless against somebody who threatens to kill them, and even then many (most?) ardent antis would simply blame guns even more and call for their abolition.