Why is 5.56 ammo more expensive than. 223?

It's loaded to higher pressures.

At the muzzle the 5.56mm round has a 30 fps lead on the .223 which for all intents and purposes is meaningless. At 50 yards the difference in trajectory shooting with a 100 yard zero is .3 of an inch.

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It's loaded to higher pressures.

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This plus the fact that it's military spec ammo. You could also be looking at green tip 5.56.

If you look at quality hunting .223 ammunition you will see it's much more expensive. But if you're just comparing FMJ ammo, the 5.56 will generally be more expensive.

Wolf brass case is .30 per round which is not that far off from brass cased 5.56. If you're comparing steel case .223 to brass case 5.56 you're not comparing apple to apples.

Sooo...30 cents per round and then shipping

Oh, I meant shipped. But yeah, close enough.