Period correct rangefinder

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tom in nc

45 Cal.
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Anybody made their own rangefinder like the one shown here. I know they cam be bought fro about $20 but I think it would be neat to DIY. I probably would need to buy one to get the dimensions for the markings, or borrow a modern one from a buddy that hunts and have a 6ft tall helper (my grandson). The 6ft tall helper because I understand that the calibrations were/are based on a 6ft tall person.
 
You don't need to buy one to get the dimensions. Choose an object of the height you wish, say 30 inches for a deer at the shoulder. Measure out 10 yds, sight, and scribe a witness mark, then measure out 20 yds, sight, and scribe a witness mark,...and keep repeating out to about 125-150 yds or so. Take your brass blank home, and treat your witness marks with punches, dremels, or other methods of engraving, and you're done.

I believe the device in your illustration is designed to be used on an object 6 feet in height (a man or moose). I would make one from scratch using whatever height you wish.
 
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Wedges!
Wedges!
We don’t need no stinking wedges!
How about we put a 12" gong up anywhere from the muzzle to 500 yards.

I'm willing to bet money I'm on it before 99% of the people can even get close. My wedge is quite proven.

My friend has the same rifle set up differently. He asked about the wedge. He ranged a coffee can sized rock at 290 yards....and I smacked it first shot.

He now wants to build a wedge.
 
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