Sydney, will dig up what info I can and PM it to you.
My own HW is a very early gun, 3xx, and chambered for 32-20 but the bore is a sewer pipe. I've been wondering what to do about it for a while now. Last year I posted on the ASSRA forum and got a lot of help, turns out all those guys are here now. If I could only decide what to do with mine....
I'll see if I can find those names tomorrow but JT's advice is sage. And Brent recommended that I consider the 38-72 in the small shank if I wanted a long cartridge.
Glad you guys are here.
Rob