Hello,
I just purchased a Martini-Henry Mark IV in 577-450. I have been over on the Single Shot forum asking about loads and bullets. Most of the loads mentioned use BP, I was also looking at the idea of using smokeless power. I have some IMR3031, Trail Boss, and some .458 cast boolits I use for my 45-70. I have never paper patched before, I have been lurking on the forum and reading posts. I hope that I can use some of the components that I already have, makes my wife happier! Thanks in advance for any and all help and suggestions.