When permanently moving a web site, or a web page, best practice is to use a 301 redirect. 302s in this situation seem incorrect. By saying "temporary move" a 302 tells search engines to keep the old domain or page indexed, but it would be desireable for them to index the new location. In the past people have used 302 redirects in an effort to circumvent the Google aging delay. This workaround might have worked at some point, but it is not a current best practice.