In Winchester/Western put "for repeaters" on SOME boxes of shotshells in an attempt to induce consumers to assume a special suitability for the task and use them in their pumps and autos. I do not recall them stating "for repeaters only". I also do not recall ever seeing a "high brass" box of shotshells from the 1920s onwards the states "Not for use in double barreled guns". So where do we divine the "intention" of the shell companies to segment the market into high brass for repeaters and low brass for doubles? Viewing a couple pages of shotshell ammo in a 1930s Stoeger catalogue would not have lead a Depression era sport to that conclusion. As Dave has often stated, the Fox catalogues long before WW2 state their guns are for use with 2 3/4" ammunition and virtually all Foxes of the era had 2 5/8" chambers (as measured by many, many time...) As anyone who has actually fooled with this subject knows the expanded length of fired pre- WWII paper shells varies considerably (as does that of many modern plastic cases) thus in some case negating the nominal length stated for them. In many case this makes moot the "1/8". difference in chamber size. Also I would not "blame the tool" so much. The Galazan brass blade chamber gauge is pretty darn accurate in my experience and can be relied upon when compared to bore micrometer measurements or go/no go English style chamber sizing plugs checks of the chamber size 95% of the time.
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