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Don't get clever and use these wacky non standard status codes like 307 308 303 your at the mercy of Google as to how they will treat them.

99.9% of the time use a 301 redirect.

They're not non-standard, and any unrecognized 3xx codes are treated as 300.

And you know exactly how google, bing et al handle this situation.

Isn't 301 a permanent redirect (and will be cached as such) and 302 is temporary?

Yes and no. 302 allow the user-agent to change the HTTP method to GET. 307 is the temporary redirect, equivalent to the permanent 301.

err No a temporary redirect is not the same as a permmenat one