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Leupold Reticle Subtension

 
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  #1  
Old 10-21-2007, 06:53 PM
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Location: Windsor, CO. USA
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Leupold Reticle Subtension

I can't find this info on the net, and Leupold's "new" support site pretty much sucks right now. I hope they can get it working properly, but I bet sombody here knows or can tell me where I can find the answer to my question. I have a 6.5 - 20 X 40 AO Vari-X III fine plex, and I'd sure like to know what distances the reticle subtends at the various magnification ranges. The range finder decided to act up during elk season and I thought it would be nice to have a back up way to estimate distances. Does anybody know this info or where I could find it? I supposed I could call Leupold but I thought I'd try here first.

Thanks,

Hicks
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  #2  
Old 10-24-2007, 08:59 PM
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Stick a yardstick up on the 100 yard target and look.
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  #3  
Old 10-28-2007, 06:22 PM
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I also apply the plex reticle for rangefinding, and the system i use is based on the mil-dot mil-ranging formula. Just substitute the plex subtension where the milliradian subtension is, and use it the same way the mil-dot is used. This is what i refer to as the modified mil-ranging formula.

I looked up the reticle subtensions for the new VX-III 6.5-20X, and they are 8.5 and 2.8 inch per hundred yds. plex post tip to post tip respectively. Of course the 20X subtension is too narrow to use for big game, but the 6.5 would work well enuf. Using say 25 inches for back to brisket bull maybe here's the ranging chart--

25 x 100 / 8.5 / 1.0 = 300 yds. (bull brackets the plex post tip to plex post tip 100% or 1.0 of a "subtension unit")

294 / 0.9 = 325

294 / 0.8 = 370

294 / 0.7 = 420

294 / .6 = 490

294 / .5 (x-hair) = 590

Here's the range sticker--

6X-1.0-300
.9-325
.8-370

etc. to as far out as u feel comfortable using it.
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  #4  
Old 10-30-2007, 03:43 PM
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Thanks for the info, I really appreciate it. Question: where did you look up the reticle subtension? I can not find it anywhere, including Leupold's site. Also, stupid question, can you explain which dimension is which (8.5 vs 2.8)? Is that vertical and horizontal?

Hicks
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  #5  
Old 10-30-2007, 05:03 PM
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Call Leupold ((by phone), and ask for the catalogue - you'll have it in a few days - they have all the reticles, and the subtensions at different powers. It's a good resource to have.

.
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  #6  
Old 10-30-2007, 05:09 PM
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Location: Pueblo, CO
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Exactly! The optics catalogs are the handiest resources u can ever have, IMO.


Quote:
Originally Posted by Hicks View Post
Thanks for the info, I really appreciate it. Question: where did you look up the reticle subtension? I can not find it anywhere, including Leupold's site. Also, stupid question, can you explain which dimension is which (8.5 vs 2.8)? Is that vertical and horizontal?

Hicks
It's not a stupid ? at all. Take a look thru your scope and adjust the power--u will quickly see which dimension is which. 8.5 IPHY = 6.5X, and it is good for the vertical axis as well as horizontal.
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  #7  
Old 10-31-2007, 10:54 AM
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Join Date: Sep 2007
Location: Windsor, CO. USA
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Thanks, I will order one today! And, thanks for the clarification on the dimensions. I'd be nice of Leupold to put that stuff on their site though.

Hicks
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