Been doing a little searching on the “round in chamber” question. I found one blog making that claim, but also found another one quoting a Boston Herald story saying an expended round was found at scene. That was my recollection, but haven’t found the document again. The original police report says nothing either way. The scene tech’s report should be released as part of the discovery in coming days, though there’s still a delay possible because the iss ue of redaction of witness names hasn’t been resolved completely.
http://www.thetruthaboutguns.com/2012/03/robert-farago/george-zimmerman-shot-trayvon-martin-once/
Also found some statements about the magazine being full, but that’s subject to dual interpretations.
Put that in a search engine and you will find numerous national publications that carried the story. Like the Seattle Times version I linked above.