I visited Fort Barrancas just under two years ago, I could not figure out just what that was for. Testing powder make sense. It did not look as to take recoil too well.
With all the brickwork into the fort, the ally ways and rifle slots, would be a costly battle to breach the fort. The guns overlooking the bay were interesting as most all guns are.
Not to get off topic, The Naval Aviation Museum is well worth the time spent.
Rick