Quote Originally Posted by Aragorn243 View Post
The casing is not full length
That would make it like the old firing system we had for one of our smoke grenades, the HC-C1A1... It had a .45 Colt cartridge to fire it. The cartridge was filled with lead and only had a small channel through the center containing FFFG black. It used a large pistol primer and would back out upon firing so you could hand remove it once cold. The originals were marked .45 GRENADE...no living example in my collection. These were a full size pistol cartridge though, that's why I wondered... Neat example.

I've heard the Adrian was a VERY comfortable helmet.