IMR Trail Boss wasn't made bulky to prevent double charging, it was to solve the problem of inconsistent ignition when using tiny charges of 2.5 to 5 grains of denser powders like Titegroup, Clays, Bullseye, 231, etc. in .357, .45 Colt or .44-40 cases.
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Sometimes the squeaky wheel gets replaced...
SASS 47015
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