Load Family into family Editor, get bounding box or geometry, Rollback load.

I want to 

Load Family into family Editor, get bounding box or geometry, Rollback load.

Is there method for doing this without resorting to placing an instance programatically and using the document changed event? I don't want slow data grab or overly complex code. However if this is the only method, can someone point to the post instructing how to do this?