I have three .25 Cal RF tool blanks in CWS cases headstamped “S” (See below). The case length is.389" / 9.86mm.
This is from the site “municion.org” which says it was made by “Smith & Wesson Ammunition Co., de Rock Creek, Ohio”. Is this correct? I always thought these were French. They came out of the box of a French stud driver tool I saw for sale. I have (presumably) green (Low), yellow (low/medium), and blue (medium) power levels.