I use the 8mm Lebel dies to form the necks and bump back the shoulder.
Works OK for me but you have to be careful to set the die height properly.
My brass is all Berdan so I use a Berdan Primer decapping tool.
One other thing, that cartridge was originally developed for Black Powder and ONE of the last firearms made for BP.
There were several different loads made for them which included lead bullets, paper patched lead bullets, cupro nickel jacketed bullets, copper jackets and supposedly some soft round nose, jacketed bullets for hunting and wooden bullets. Of course, because the cartridges are loaded into a tubular magazine, the bullets need to be round or flat nosed.
I've tried all sorts of bullets in my rifles but they all have slightly different bore diameters. I find paper patched lead bullets work best and you don't have to worry about sizing.
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