"sight pin rangefinder" (info. wanted)

[grndhntr]

I know I've seen this before on line but I can't seem to find it now. Does anyone have an avg. measurement from the top of back to the belly on WT deer, mule deer, elk, pronghorn antelope, etc.? If I can find info. I would like to play around with a "sight pin rangefinder" to see how accurate it is. For example, maybe for a deer, if I can look through my sight pins and the animal fits between my first pin and my third pin, the animal is approx. 25 yds.away.If it fits between my first and second pins, it's at 35, etc. This could be a quick (although not super accurate) way to get an approximate distance. The animals I'm most interested in is mule deer, elk, and pronghorn for this year. Does anyone know these measurements? Thanks.

[Dnk]

Shepard uses this princple. Here's a link to the page you need. They are very cool scopes. I just don't have an excuse to buy one.
http://www.shepherdscopes.com/range.asp

[grndhntr]

Thanks Dnk. That may get me close. Sounds like he uses an 18" standard for his scopes. I hadn't thought about using the same measurement (18") and seeing what was that length on different animals, ie. 18" from nose to back of head on an elk and 18" from shoulder to brisket on a deer. I'll have to play around with this and see how it works.