So after many treks through and across the web I searched for a local Customs office and called them. Once I got the agent talking he told me everything to do and whom to call ( Local TSA etc.), He really liked to chat. He said to get the form 4457 to start so I printed 6 copies off the web. He said to have at least one completed 4457 for each separate firearm and keep the stamped (?) ones until I sell the rifle. He said if you use a 4457 that has multiple weapons listed you may have trouble if you use the 4457 at a later time and don't have all the items on it at the time you try to come back (does that all make sense?).
So, I've since called all his numbers and now feel squared away and I'm ready tp get Delta Airlines to commit as to what their ammo polices are at San Francisco Airport; I'll keep you all updated.
Thanks for replies
duckklr