Stainless steel fret wire is much, much harder than nickel/silver fret wire. Your tools are either dull and worn out, or you are using the wrong tools. For stainless steel fret wire, diamond coated files are recommended. Brand new, high-carbon regular files will work, but they will dull much faster.
Here is an example:
https://www.stewmac.com/luthier-tool...ret-files.html
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Leonard
1918 Gibson L-1
1928 Gibson L-4 (Blond w/Ebony Fret-board)
1930's Kalamazoo KG-32
1930's Gretsch F-50
1934 Gibson L-7
1934 Gibson L-50 (KG-11/14 Body Shape)
1935 Gibson L-50 (Flat-back)
1935 Gibson L-30 (Flat-back)
1942 Gibson L-50 (WWII Banner Head)
1948 Gibson L-50
1949 Epiphone Blackstone
"a sharp mind cuts cleaner than a sharp tool"
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