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I do know the true Keith bullet is square grooved ,the round groove is a Lyman change to get it to drop from the mold better.I`ve also had input on this pic saying the narrower/smaller dia. front band was to address chambering woes (the band was larger than the throats of the cyl causing a balking issue)
Also Mr. Keiths drawings had all 3 bands the same width .
Measurements pending Mike.
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GP100man 
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