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I have not heard reliably of a gun blown up because of the invidious airspace, but a friend had a barrel bulged by a short started ball.
The guy he loaned it to shot it until heavily fouled, got a patched ball stuck partway down, and shot it out. TC made it good but my friend was sorry to lose his low numbered barrel. Said the replacement was never quite as accurate.
The Shiloh board has considerable discussion on ringed chambers from over powder wads with air gap under the bullet, but that is not quite the same thing.
But I thought the .45-55-405 carbine load had a cardboard tube insert to reduce internal volume.
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