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In my BP days, both muzzle loading and cartridge, since I'm a machinist, I used water soluble cutting fluid (not, soluble oil!) for my BP clean up and short term storage. I didn't start out that way in muzzle loading, I used a bucket of hot water and "pumped" the barrel clean, between shoots. But, almost every time, surface rust would appear after a day or two. I did always use cutting fluid (20/1) for my patch lube though. At some point, I started using the patch lube to do my finish cleaning, followed by transmission fluid and found NO rust developed after one week, then two weeks and even three weeks, if I went that long w/o shooting a match. I never used that bucket again! When I got into single shots, I of course used it at the end of the day, followed by straight, transmission fluid and nothing else, until the next match. When I finally quit shooting muzzle loaders, I stored my rifles, for years that way. I didn't think about it, until a few years ago and got worried, I went back and checked them and absolutely no rust after more than 25 year, in my gun cabinet, inside the house. The thing about modern water soluble cutting fluid, is that almost all variety's have a rust inhibitor that protect the muli-100's of thousand dollar CNC machines. CNC's are almost totally submerged in there coolant and are not cleaned and surface oiled each day on the bare cast iron tables and other bare, exposed steel surfaces. It very good stuff and made to prevent rust. Frank
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