Re: stainless galling
S&W had the same problem when they first introduced their revolvers in S.S. It was soon discovered that the internal parts that interacted with one another would gall. Proper lubrication helps. Parts that are closely fit and highly polished help the situation ,too. Hardness is another factor (yes, the 400 series can be heat treated). It's the reason I have trouble getting excited by production S.S. actions. Your galling problem can be resolved with careful hand work and polishing. Depends on how much time or money you are willing to spend.