Nikon BDC circle spacing?

Discussion in 'Long Range Scopes and Other Optics' started by clhman, Jun 15, 2010.

  1. clhman

    clhman Active Member

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    Does anyone have the measurements for the BDC reticle? I'm going to the range on Thursday but I'd like to know the spacing now so I can build a drop chart beforehand. Can anyone tell me the exact distance between the circles at 100yds? Your help would be greatly appreciated. The scope in question is a 4.5x14 Buckmasters.
     
  2. old_heli_logger

    old_heli_logger Well-Known Member

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  3. adam330

    adam330 Well-Known Member

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    Im not exactly sure of the spacing, but if you know your load data give this program a try. It will tell you what circle to use for what distance at any given power. www.nikonhunting.com/spoton
     
  4. winmag

    winmag Well-Known Member

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    It depends. Supposedly(non magnum) its 0at 100, top of next circle is 175, center is 200, bottom of circle is 225, between the two is 250..... and so on. Trajectory will depend alot on what wt. bullet, and at how fast. The little booklet contains all this info as well as ''tuning'' your drops...... I dunno..... I have one, but its not mounted. I trust my Burris in my 270wsm with 140 Accubonds. Its pretty darn close. But the circles in the Nikons.... I just dont know.
    The only real way to find out is to shoot it and record the data under multiple conditions, and elevations. I have done this with my Burris for a couple years, and have come to know it pretty well. I got a great deal on the new Nikon, so I bought it. But..........the circles drive me nutts. I havent had the heart to mount it yet to check the actual drops. Good clear scope for the $ tho.
     
  5. clhman

    clhman Active Member

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    I've got the bdc manual and it is really vague. I ran my ballistics through 2 separate programs and have the data for the load (.223 50nosbt @ 3368fps), but what I need to know is if the first circle is 3" below the center or 2" etc...Nikon doesn't say anywhere. The only foolproof way is to aim it at a target 100yds away and take notes. Thanks for the suggestions.
     
  6. clhman

    clhman Active Member

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    Nevermind that last. Thanks adam330 that's exactly what I needed!lightbulb
     
  7. sscoyote

    sscoyote Well-Known Member

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    At 14x it's--

    2 IPHY
    4.5
    7
    11
    15
    to center of dots and the subtension of the stadia lines are 0.5 IPHY thick. Nikons catalogs have the best Spec Pg. in the business. They're very handy for subtension info.
     
  8. clhman

    clhman Active Member

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    Thanks for the info. Is iphy the same as moa @ 100yds?
     
  9. cross

    cross Well-Known Member

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    You know I've been wondering the same thing. I didn't have that info for a Burris reticle so I took it out to the range, turned the scope to 14x and layed the cross wire on the top of a yard stick at 100 yards. I then looked at where the marks on the ballistic plex reticle fell on the ruler and deemed that the MOA at 100. I later found out the published values and they were the same as those I had earlier measured at the range.

    For the life of me I can't figure out why they don't disclose the MOA spacing on their reticles. They act like if people have that information they won't be able to accurately apply it so they keep it a secret! Anyway, that's what I do but when I last had my hands on a Nikon I didn't have time to run out and do it so the mystery remains.

    Just a thought.

    Cross
     
  10. sscoyote

    sscoyote Well-Known Member

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    They do provide that information. It's in their catalog. At least it used to be--haven't checked the current 1 yet. Leupold, Burris, Nikon, Vortex, NF, Sightron advertise that info in their catalogs. The rset you have to measure.

    MOA = IPHY (inch per hundred yds.) divided by 1.047.