Dave,
I just wanted to say how much I enjoyed seeing your 120mm stuff. Especially the Conquerer rounds with the "threaded" case mouth. The case looks to be the same shape as the WWII U.S. Antiaircraft case, which later became the case for the Marine Corps M103 Tank. The U.S. used mouth plugs without threading though.
I also saw your Jagerfaust projo on your profile. I have one, but mine isn't painted.
John
I checked mine tonight. It is fired, pitted all around with no paint. It is filled with tar, has a fuze sitting in the nose, but no threads on the projo.