Neat stuff Al
I remember when the USAC stuff came out in (I think) the early 80's. They also had a hand held loading tool along with special bullets for reloading this ammo. I may still have one somewhere, but dont hold me to that.

I think I still have some of the PMC "Tubular" ammo somewhere. They made it in 38 and 44spl. It was a turned bronze bullet with a hole bored all the way through the center. There was a teflon plug in the base that dropped away when fired.
The lawyers got ahold of it due to the cookie cutter effect it had when you shot someone with it, and it was pulled from the market.

Incidentally, I have a whole S**tload of oddball ammo. If there is something you want or are looking for, email me and I'll see if I have it.