
The T387 projectile was designed to provide a long range toxic chemical offensive capability.
This was a thin-walled, extended range, projectile that held approximately 50% more agent than the M121. It was a separate loaded, central burst round filled with VX for antipersonnel effects. It was similar to the HE round except for the filling and the burster. The burster charge, contained in a thin metal tube, was held in place in the burster casing by a fuze well cup.
The forward end of the burster casing was assembled to the adapter in the nose of the round and extended the full length of the cavity. The adapter was thin-walled steel with a nose formed to a long ogive. A single rotating band was located near the base of the projectile.
No information about functioning.
Projectile, 155mm Chemical, M121
Old Chemical Weapons and Related Materiel Reference Guide (2018)