40mm (and 20mm)

So I was looking for "sin stocks" to invest in this morning, and came across a link on a website for thematic investing (motif) that had National Presto Industries under "Guns & Ammunition".  Their site is for crockpots.  Well, it turns out from their investor info that one of their subsidiaries, AMTEC, manufactures ammunition for government contracts.  Apparently they also manufacture 20mm cartridge brass!  Information comes from the strangest places.

Rare Ammo

A place I found online, Ammo-One, sells exotic and rare cartridges, such as .950 JDJ.  Sweet!

However, they don't have 20mm, probably because it's for Destructive Devices.  Somewhat related, a Federal website (FBO) has "business opportunities" for manufacturing 20mm ammunition.  That'd be sweet to get into....

20x110mm Hispano?

Apparently both Anzio Ironworks and Serbu Firearms have a semi-auto 20x110mm Hispano rifle in development.  Neither company lists it on their website, but there are videos on YouTube.  (For a second, a frivolous use of my WDC stock largesse popped into my mind....)  Those cartridges have to be like $20 a pop!
 
Anzio semi-auto 20mm
Serbu's Typhon 20 rifle - the comment says it's the Navy M21A1 round, but in other commentary I read it's 20x110mm