how do i sell my rifle if the gun is joint registered to my wife and I? do we both need to go down to hpd to transfer out of our name or can i just call them? I'm going to sell the gun to a FFL licensed holder.
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Nothing special to it. 

Selling it in state?  Then the fact that someone shows up at HPD's window to register the rifle serves as notification that the ownership has changed.  I would make sure that both of your names appear on the bill of sale, but that's just me liking to document things.

Selling it out of state?  Write HPD a letter with both of your names on it telling them where the gun has been sold to.  You could, if you prefer, wait through a 4-hour line to pick up a 1-page form that accomplishes the same thing, but there's no law requiring you to use their form.  There is a law requiring you to notify them that you sold the gun, though.

sweet so that means I don't have to coordinate a day for both me and the wife to get off and wait in a four hour line just to say i sold it to this guy? Just mail them something with our names and the name of the new (local) owner? that simple? thanx I just wanna be clear if it means not having to do the above.

sweet so that means I don't have to coordinate a day for both me and the wife to get off and wait in a four hour line just to say i sold it to this guy? Just mail them something with our names and the name of the new (local) owner? that simple? thanx I just wanna be clear if it means not having to do the above.

Correct. 
Again, if the new owner is local, they have to register the gun, and that process serves as notification.  It's only if you are selling or transferring the gun out of state that you need to write that letter. Although 'better safe than sorry' may apply.