This is probably obvious to most of you but I don't think I covered a Google saying that 302 redirects to indeed pass PageRank, aka link juice.
John Mueller of Google said this in the comments area of a Google+ thread:
it's incorrect that 302 redirects wouldn't pass linkj Pagerank. That's a myth.
So using a 302 is fine, although I'd still recommend a 301 where you know the move will stay in place forever. It is just that many folks use 302s without thinking and Google needs to handle it.
Forum discussion at Google+.
Image credit to Barry Makariou.