That's what is stamped/printed on the pipe (in the images). Also punt guns would be mounted to a boat or use a the boat or earth as support for shooting them. A

That's what is stamped/printed on the pipe (in the images). Also punt guns would be mounted to a boat or use a the boat or earth as support for shooting them. A punt gun would also be loaded like muzzle loader. Here's video of someone loading a punt gun, and they are putting 1/4 pound of black powder in it. https://youtu.be/fg85k28b_dM https://youtu.be/fg85k28b_dM Putting the amount powder required to shoot the shot for a punt gun would just make the PVC a suicide device. So same result for anything that would fit in 43mm pvc like a grenade, mortar or cannon/artillery shell. Edit: Basically, my point is a punt gun never really had shells, they were muzzle loaders.