Question abt Leupold Boone & Crocket 3.5-10: Second scale on power ring

Discussion in 'Long Range Scopes and Other Optics' started by MyTargets, Nov 22, 2008.

  1. MyTargets

    MyTargets Member

    Messages:
    8
    Joined:
    Feb 25, 2007
    On my VX-3 Boone & Crocket 3.5-10 there is another scale on the power adjustment ring other then the power scale. It is on the rear side of the ring and it says YDS/M and has a scale of 2-6. Can anybody tell me what this scale is for?

    Thanks for your help.

    MyTargets
     
  2. sscoyote

    sscoyote Well-Known Member

    Messages:
    1,258
    Joined:
    Feb 26, 2003
    That system was borrowed from the traditional Vari-X III and VX-III range estimating system (RES). If u bracket a std. deer (16" back to brisket) between the center X-hair and plex post tip and adjust the power ring till it occupies 100% of the bracketing gap u then read off the distance in yards (or meters, i guess), and that's supposed to be your range to the 16" tgt. (2-6 = 200 - 600 Y/M).

    ...but there are better rangefinding systems that can be used with plex reticles.
     
  3. MyTargets

    MyTargets Member

    Messages:
    8
    Joined:
    Feb 25, 2007

    Good answer. Thanks for your help!
     
  4. MyTargets

    MyTargets Member

    Messages:
    8
    Joined:
    Feb 25, 2007

    Good answer. Thanks for your help!
     
  5. lurcher

    lurcher Active Member

    Messages:
    44
    Joined:
    Aug 23, 2006
    So for the B and C reticle you bracket between the upper picket and horizontal cross hair, or first bar below the cross hair?
     
  6. sscoyote

    sscoyote Well-Known Member

    Messages:
    1,258
    Joined:
    Feb 26, 2003
    The upper picket (upper plex post tip) and X-hair.
     
  7. sscoyote

    sscoyote Well-Known Member

    Messages:
    1,258
    Joined:
    Feb 26, 2003
    ...but if u're going to try and use the reticle to rangefind u may as well use it as effectively as possible. What i use is a modification of the mil-ranging formula that's described here--
    www.ottllc.com/specialtypistols/sp20.pdf under Item C) Reticle Rangefinding

    With the B&C reticle just bracket the 16" tgt. between X and 3rd stadia down (6.55 inch per hundred yds.) @ the optics highest power. If he fits perfectly he's 245 yds. away ( 16 x 100 / 6.55 / 1.0 = 244). If he fills 90% (.9) he's 270 yds. away (16 x 100 / 6.55 / 0.9 = 271). Here's the rest of the ranging chart for the 16" tgt.--

    .8 = 305
    stadia # 2 = 320
    .7 = 350
    .6 = 407
    .5 = 490