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... as long as you
... ONLY neck size, if at all. If you are lucky with the chamber neck and only use soft to moderately hard lead bullets, then you may be able to avoid even neck sizing.

......

Sorry, can't help you with suppliers. I live in Mauserland.

In my honest opinion, based on not inconsiderable experience with BP cartridge guns**.... don't bother. An 1873 Springfield has no bolt lugs to wear - it has the trapdoor. And it was made about half...