I've shot a bit of all sorts of stuff. That was really neat shootin that ol Martini though. I also had a 38-56 Win 86 and it was almost like that. I loaded the ammo with ctg pyrodex and they shot fine. Can't remember where i found the data now. Sold that ol rifle. The gummit runs outta all kinds of stuff...always at the wrong time too. And it always costs us extra.
I really don't know if they are the same but I listed some 577 cases on swap and shop. They are the 3 1/4 inchers though. Maybe I should get ahold of my friend with the rifle. He just might need 'em. The rifle he has is in exc condition and even has what is supposed to be the orig bayonet. Glad i didn't have to use one of them in the wars as the Brits say!