I have a Remington Rolling Block that is in pretty nice condition...action wise. I would like to rebarrel it and I'm not really finding a whole lot as to what is actually intailed. Most I see are rebarreled in 45.70. Is this due to the amount of work needed done to the extractor? Is this still a blackpowder cartridge or are they using smokeless? I've seen others that I'm sure are smokeless so I just wonder what the limit would be in this action. If anyone can offer some advice here that would be great. If anyone has done such a project and wants to throw some pics up...awesome!