16" shells

The deadline for submitting proposals is past, and unfortunately "Open Burning and/or Open Detonation (OB/OD) are not permitted technologies for any end item(s) or component(s)."

There might be a loophole there, though. If the detonation were underground... You'd need to keep people at a substantial distance, but perhaps it might be an alternative to Burning Man.

If you insist on being boring, try to imagine how to safely disassemble something full of Explosive D: a combination of picric acid and other substances. Maybe it isn't so boring...