SKANS-- That was what I was thining. You canstill buy various reload kits for the 37mm, so in a serious situation, differenttypes of loads could be loaded and produced. There were very many different types of 37mm rounds being sold out there 10 years ago. I was under the same impression, that they do not have to be registered unless they are 40mm.
In my opinion the real use of either one is very limited. The cool factor is pretty high though.
This was my initial feling also, just wanted to see if anyone could come up with a reason to go all in on a 40mm, instead of running all that $$ into a more extensive 37mm setup.
Back on topic now--- not trying to hi-jack your thread!!