This is another cartridge that I can find nothing on other than the basic facts. It was an attempt to develop a shoulder fired antiarmor weapon and ammunition. Obviously they were not going after main battle tanks. The projectile is a heavily modified 40mm grenade style. There is no rotating band or gas check seal. The tail fins look a little ridiculous on something of this size, but they needed some form of stabilization. The case is aluminum and is 4 inches long. The overall length is 6 1/2 inches and the base of the case is 1 7/8 inches in diameter. The only non-aluminum parts are the primer, shaped-charge liner and a thin band of plastic just under the ogive on the front of the projectile. I think it dates from the early 70's, but I am not sure. Anyone out there seen this before?