What is the launching principle of a shell-less projectile?

Principle: Shell-less ammunition is a kind of ammunition design that abandons the shell casing and directly charges the bullet into a solid block to connect or contain the warhead. A bullet without a shell is a bullet without a shell. It consists of combustible binder. First, the powder used for firing is bonded, then it is shaped into a solid cylinder (according to the special firing caliber), and then the warhead and primer are embedded at both ends of the powder column respectively.

Because this special bullet has no casing, the primer works in different ways. In addition to the traditional firing needle, you can also use electric ignition primer and gas ignition primer, and use the arc and high temperature generated during firing to ignite the grain, so that the high-pressure gas expands rapidly and pushes the bullet out of the gun bore. Shell-less bullets have a special shape, a slender warhead and a slightly stout body. When launching, the warhead flew out of the muzzle under the push of the gas generated by the burning grain, and the grain was burned to ashes. 100 shells only weigh about 20 conventional bullets, so soldiers can carry many bullets with them when fighting. This invisibly improves the continuous combat capability of individual soldiers.