TCO mega is spot on. they do require you to have a lock on the pistol case and you checked bag.
You can have ammo in the same case.
Good thread. I am flying next month on Delta domestic and have never done this before.
Got a pelican case and cut out the middle foam piece for a custom fit for my scoped rifle, 1 box of ammo in factory packaging, and my bolt. Thinking having the bolt removed will help demonstrate (if/when scanned) that it is indeed unloaded. Gonna get a couple of keyed alike master locks at home depot. Hope everything will be smooth sailing.