Bullseye shooters used to number the cylinders that way, the reasoning was that they would reload a case in the same way every time, by say seating the seam on a cast bullet to line up with a certain letter on the base of the cartridge case, then line up that same letter pointing to the number on the cylinder, theoretically resulting in consistency. Whether it worked or not who knows, seems under recoil the cases would move, but serious accuraccy nuts would try anything.
That's the way it was explained to me, I have a pristine 25-2 that is marked like that, came with a note explaining the exact load to use, seems that the old crank knew his business, it is super accurate.
RD
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