What model do you have? I am picking one up tomorrow a mark 4 year it was born 1887.Thanks. I've been reloading for 50 years but the .577/450 is new to me, which is sort of the fun. The unfilled space is a little concerning which is way I was thinking of Trail Boss but it might be a little to fast burning. There seems to be a lot of "art"w/ BP cartridges, e.g., paper patched bullets, greese cokies, fiber wads, etc.
Thank you for the infoI don't have extra brass but there are 2 options:
Martyn Robinson at X-ring Services
This is reformed 24 gauge shotgun brass
About $70 for 25
Bertram Brass 577-450 Martini-Henry Box of 20Bertram Brass produces high quality, consistent brass for those obscure and obsolete calibers. Imported from Australia, this brass was precisely...www.midwayusa.com