Unknown combustible

This combustible on the right is supposed to be for a seperate loading system. Does anyone know what it is for ?

Shown next to an FA 223 combustible

It no longer exists as it fell apart after about 10 years.

Binary caseless ammo were tested by Ralph Junker (owner of Junker System). Bu he developed .50 ammo. No bullet for this powder charge?

This came from the Snyder collection from Edgewood Arsenal. It came with a typical .223 US bullet.