A question for you old time Krag shooters, are these markings for reference only or do they translate into yds per hashmark at a given velocity?

I am shooting 220 grain Hornaday Round Nose over 40 grs of IMR 4350 in new Winchester brass. These are supposed to be loaded to about 2000 fps, but I did not use the Magnetospeed to verify last time out as I was too busy getting the peep windage set.

Any help would be appreciated.

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