Three-inch Ordance Rifle 3" Ordnace rifle and crew.

THREE-INCH ORDNANCE RIFLE

Made of wrought iron, the 3-inch Ordnance Rifle, also known as the Rodman, could throw a Hotchkiss or Schenkl projectile more than a mile. The Hotchkiss projectile consisted of two iron elements with a lead band between them. firing forced the two iron pieces together and spread out the lead to take the rifling. The Schenkl projectile used a papier-mache sabot that slid up an expanding shank with the force of the charge and so took the rifiling. Artillery, like the Ordnance Rifle, was seldom employed against Indians.
Shells for the Ordance Rifle.
Hotchkiss shell, the iron elements (left), the complete projectile with lead expansion ring (right)
Schenkl shell, the iron part (left), the complete projectile with papier-mache sabot (right)