Confederate

Unknown

 

DIAMETER: About 7 inches (estimated)
GUN: Possibly 7 inch Brooke rifle
LENGTH: Unknown
WEIGHT: Unknown
CONSTRUCTION: Common Shell
SABOT: Copper
FUZING: Bourbon-James "reverse" percussion

Unfortunately no data is available for this very interesting projectile.  A film negative only is in possession of the Washington Navy Yard.  It appears to be a 7-inch projectile.   Undoubtedly it was an experimental armor puncher, the ratchets on the ogive to give it a bite on the armor and then exploding after penetration.  Only specimen noted.