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Leupold Reticle Subtension

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  #1  
Unread 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  
    Unread 10-24-2007, 08:59 PM
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    Location: Memphis, TN. Soon to be Casper, WY.
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    Stick a yardstick up on the 100 yard target and look.
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      #3  
    Unread 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  
    Unread 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  
    Unread 10-30-2007, 05:03 PM
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    Join Date: May 2001
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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  
    Unread 10-30-2007, 05:09 PM
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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  
    Unread 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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