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Leupold Duplex reticle for range estimation?

Discussion in 'Shooting Gear and Storage' started by 686+, Oct 8, 2009.

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  1. 686+

    686+ Member

    Joined:
    Jun 19, 2003
    Messages:
    103
    Location:
    Longmont, CO
    Does anyone have a MOA or inch@100yards number for what a Duplex reticle on a Leupold covers? this perticular scope is a 3-9 x 50mm VariX -IIc.

    I want to use it as a rough range estimation tool, for my first hunt this winter!

    Thanks.
    686+
     
  2. sscoyote

    sscoyote Member

    Joined:
    Mar 21, 2005
    Messages:
    347
    I don't have my catalog with me right now but that info is all on the Subtensions pg. Most of the Leup. that have the RES system use a "thin opening" subtension (plex post tip to plex post tip) of 5.4 inch per hundred yds. @ the optic's highest power. I use a modification of the mil-ranging formula and just apply the plex reticles for rangefinding just like a 3 point mil-dot (2 units of subtension). Here's the mil-ranging formula in it's most basic form (inches to yds.)--

    tgt. size (") x range of reticle subtension measurement (usually 100 yds.) / reticle subtension (") / "mil-reading" (decimal equivalent) = range in yds.

    Example-- 10" tgt. that occupies 9 tenths (0.9) of the 2.7 IPHY x-hair to plex post tip gap--

    10 x 100 / 2.7 / 0.9 = 410 yds.

    If it occupies 8 tenths (0.8) then it's

    370.3/0.8= 460

    Here's how my dope would look taped to my gun somewhere
    X-P (x-hair to plex post tip)

    1.5P-250 (P= point blank range)
    1.4-265
    1.3-285
    1.2-310
    1.1-335
    1.0-370
    .9-410
    .8-460
    etc. to about 500 yds. max. (for me)

    ...see how it works? This is faster more accurate, and more flexible than the RES Leupold uses.

    I would also calculate a point blank power to adjust my scope to in case u get a close shot but aren't quite sure if the animal is within PBR or not. If interested let me know and i can explain that.
     
    Last edited: Oct 8, 2009
  3. sscoyote

    sscoyote Member

    Joined:
    Mar 21, 2005
    Messages:
    347
    Just looked at my catalog and it says the std. Duplex in that optic measures 6.2 IPHY between post tips.
     
  4. 686+

    686+ Member

    Joined:
    Jun 19, 2003
    Messages:
    103
    Location:
    Longmont, CO
    sscoyote,
    thank you for your help. Luppy replied to my emails and sent the following:

    The fine duplex reticle on that scope will subtend 16in on low and 5.5 on high at 100yds.

    I would have thought it would have been more like 23 inches at 100 yards, due to the measuring I did at ~10 yards. I need to go back and re check.

    Thank you for your help I think I will work out the distance ranges and tape a card to my stock too!

    686+
     
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