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Speed strips, ammo wallets, magazines, etc, aren't considered "secure containers" for ammo. But the cardboard box it came in seems to be just fine. Oh, and don't try to carry it in any of those fancy plastic containers that reloaders use either.

Cardboard boxes, that's what you need. With the original factory writing on it. Even if it isn't the same ammo that belongs in the box, it's OK. Just as long as it is cardboard.

Trust me, as one who flies, and has previously tried to apply logic to this process. I have given up my share of ammo to the TSA.