Sharps4590,
The gun was kinda heavy and shot like a big 22! I think I had to make a mainspring for it. Been too long ago!
I did read there were 5 different cartridges based on the same case separated only by oal- 9.3 x 57, 62, 72, but can’t remember the other two. I think the 72 was the longest.
It was fun.