Building a drop table off mil dots

Discussion in 'Long Range Hunting & Shooting' started by linksmechanic, Aug 10, 2008.

  1. linksmechanic

    linksmechanic Well-Known Member

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    If I build a drop table off mil dots using exbal do I need to focus my scope at certain power? I'm currently using a mark 4 6.5-20x50? I can't seem to find any info about this in my owners manual.
     
  2. dogdinger

    dogdinger Writers Guild

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    my guess would be yes.....mildots are differrent distances apart at differrent magnification settings. scopes usually are set to use mildots for ranging at only one power setting, mostly 10X
     

  3. KRP

    KRP Well-Known Member

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    Yes, or do the math for different magnifications or get an FFP scope.
     
  4. linksmechanic

    linksmechanic Well-Known Member

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    Anybody know what power I should be on?
     
  5. dogdinger

    dogdinger Writers Guild

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    it does not matter what power setting you use as long as you know how far apart the dots are at a given distance, and use the same power setting each time. for instance, my dots in a 10X super sniper are exactly 3.5 inches @ 100 yds. this gives you 7" @ 200 etc etc.....yours may only be 2 inches @ whatever magnification you choose to use. choose the mag level thats works best for your load.
     
  6. Bravo 4

    Bravo 4 Well-Known Member

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    If you are gonna punch your stuff into exbal to get a drop for mils you do need to know what power setting your scope needs to be set for mils. If you were just gonna go shoot to make your own drop chart then the setting doesn't matter, as stated above just make sure the power ring is on the same setting whenever you are gonna use the drop chart. I have never used the 6.5-20 so I can't tell you what power it SHOULD mil at. What you need to do is place a 36" target at exactly 100 yards and adjust the power setting till the 36" is on the 10 mil. Then mark that setting on the power ring, it may fall between the numbers. You can do smaller targets but it is more precise on a bigger target.
    1mil = 3.6" @ 100yards
    5mil = 18" @ 100yards
    10mil = 36" @100yards
     
    Last edited: Aug 11, 2008
  7. MachV

    MachV Well-Known Member

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    The Leupold site was not very helpfull either but they do make the mark 4 6.5-20x50 in both first and second focal plain??
    The easiest way I can explain how to find out is to put a yardstick or an inch square target @ 100 yards, then set the scope to 18x and see how far apart the mildots are?
    If the dots are about 3½" apart then your scope is front focal plane and will stay that distance @ all powers. If the dots are 2" apart its second focal pane and the dots should be mills @ 10x.
    For me its easier to set the dots to MOA but you can use the yardstick to check it out and see what works best for you. Most bulistic programs will read out in Mills and MOA but the thing is to find out what power you plan to use and how far apart the dots are,then get out and make sure it works for you in the field!
     
  8. royinidaho

    royinidaho Writers Guild

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    What Bravo4 said:

    I duplicated the Mil Dot reticle on a large piece of paper.

    All dots 3.6" apart.

    Posted the paper at exactly 100 yds from the muzzle.

    Adjusted scope power to match the paper exactly.

    Marked the scope accordingly.

    It was an expensive cheap scope, calibrated at somewhere around 11 power.

    Then repeated the process for max powder setting.

    The FFP reticle solves the variable power problem really well.
     
  9. Bravo 4

    Bravo 4 Well-Known Member

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    What Roy said...
    unless, like dogdinger, your mil subtensions aren't correct.

    The FFP makes life so much easier if you use the reticle for anything other then aiming with the center cross.
     
  10. Marine sniper

    Marine sniper Well-Known Member

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    If I remember right a mil is 3.438 inches for every 100 yards. Just like a MOA is actually 1.047 inches for every 100 yards.
     
  11. Jon A

    Jon A Well-Known Member

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    Oops. A Mil is 3.438 MOA. 3.6 inches at 100 yds.
     
  12. dogdinger

    dogdinger Writers Guild

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    i'm sure the SS is 3.6 also.....for some reason i had 3.5 in my head...... .01" is hard to read thru a scope......i do have my marks pretty much calibrated at their respected ranges....i can use the dots for quick aquisition out to 600yds if i dont have time to dial...AJ
     
  13. Nomad

    Nomad Banned

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    Would like to figure the same thing, 3.5X 10 reading is at 10 power for 3.5 or
    3.6 which ever mildot you have,
    The 4.5X 14 is at 14 power to get a 3.5 at 100 yards.
    with a 500 yard zero at center the top would be 100 yard zero with
    a 175 smk at 2600 fps the bottom would be around 850 yards now
    trying to figure out a different bullet and different speed will change again..
    Doing the math .....Priceless....
     
  14. linksmechanic

    linksmechanic Well-Known Member

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    I called Leupold and they said with the 6.5-20 to read mils at 20x.