close

Privacy guaranteed - Your email is not shared with anyone.

200yd. Zero

Discussion in 'Black Rifle Forum' started by Scamp, Jan 17, 2010.


  1. Scamp

    Scamp
    Expand Collapse
    Geaux Tigers!

    Joined:
    May 10, 2009
    2,253
    1
    Location:
    Oklahoma
    I know I have read this before but dang if I can find the thread, anyway...
    My local range has a 100yd limit.
    I am shooting a Colt Match Target Competition 20" 1-9 twist AR. w/ a Leupold Mark 4 6.5-20x50 scope.
    Black Hills 40gr. V-max moly rounds.
    Can I sight it in at a shorter distance and get a 200yd. zero? 25, 50yds??
    Thanks in advance for any help.

    [​IMG]
     

    Wanna kill these ads? We can help!
  2. GLOCKMASTER

    GLOCKMASTER
    Expand Collapse
    Mean Ass

    Joined:
    Jul 23, 2000
    214
    0
    Location:
    North Carolina
    The only way to know that you have a true 200 yd zero is to shoot it from 200 yds.
     

  3. RMTactical

    RMTactical
    Expand Collapse
    www.AR15pro.net
    CLM

    Joined:
    Oct 7, 2000
    12,603
    16
    Location:
    Behind an AR-15
    Same.
     
  4. scottMO

    scottMO
    Expand Collapse
    Moderator Millennium Member

    Joined:
    Dec 21, 1998
    1,082
    4
    Location:
    LR Arkansas
    Found this on the net, but different barrel lengths, etc...

    50/200 yard zero -- ballistics
    M4 Carbine (14.5 " BBL) M855 5.56mm ball, 2910 fps muzzle velocity
    Range (yards) 50 yard zero path (inches)
    0 -2.6
    25 -1.16
    50 0.0
    75 +0.87
    100 +1.43
    125 +1.65
    150 +1.52
    175 +1.00
    200 +0.08
    225 -1.29
    250 -3.14
    275 -5.5
    300 -8.41
     
  5. faawrenchbndr

    faawrenchbndr
    Expand Collapse
    DirtyThirty fan
    CLM

    Joined:
    Nov 24, 2005
    36,040
    398
    Location:
    Troy
    This has worked very well for me for years.
     
  6. W.E.G.

    W.E.G.
    Expand Collapse

    Joined:
    Sep 20, 2005
    673
    0
    Location:
    all over Virginia
  7. HAIL CAESAR

    HAIL CAESAR
    Expand Collapse
    Senior Member

    Joined:
    Mar 1, 2007
    5,265
    23
    Location:
    In my shop
    You'll have to shoot it to be exactly sure. You may find something close but with variables like height over bore, barrel length, different velocities due to lot specific ammo, and different barrel velocities.
     
  8. Sam Spade

    Sam Spade
    Expand Collapse
    Lifetime Member

    Joined:
    May 4, 2003
    14,747
    1,986
    I haven't seen that many samples, but the ones I have seen tell me that the things you mention are smaller differences than the limits of the rifle in question. It's a production rifle shooting factory lots, not a sniper rifle running handloads.

    And topping it, he's got a scope with .5 MOA adjustments; 1 click moves him 1". ETA: Nope, .25MOA. Still moving POI by 1/2" at 200, and his groups are at least double that.

    As always, I'm willing to be corrected.
     
    #8 Sam Spade, Jan 18, 2010
    Last edited: Jan 18, 2010
  9. HAIL CAESAR

    HAIL CAESAR
    Expand Collapse
    Senior Member

    Joined:
    Mar 1, 2007
    5,265
    23
    Location:
    In my shop
    If you go by some ballistic chart for your sole source of info and the chart maker used a 26 inch barrel and a very low mounted scope ( scope over bore height) and then the OP uses a 18 inch and a very high scope mount......then that chart ain't worth a hill of beans.
     
  10. CrazyFeet

    CrazyFeet
    Expand Collapse

    Joined:
    Jan 18, 2008
    140
    0
    you could check your 25,50 and 75 and compare it to the chart and see how close it is to you. that would give you some idea on how accurate that chart is for you.
     
  11. vafish

    vafish
    Expand Collapse

    Joined:
    Mar 21, 2003
    16,541
    29
    Location:
    Commonwealth of Virginia
    The online ballistic calculators usually have inputs for velocity, Ballistic Coefficient, and height of sights over bore to make the calculations correct.

    But they still are just an estimate and you should sight in at 200 yards if you want to know where your gun really shoots at 200 yards.
     
  12. Alaskapopo

    Alaskapopo
    Expand Collapse
    NRA ENDOWMENT

    Joined:
    Feb 6, 2000
    6,545
    2
    Location:
    Alaska
    50 200 yard 0
    [​IMG]

    100 yard 0
    [​IMG]

    25 yard 0
    [​IMG]

    If you have a 100 yard range I would sight in at 50 yards and then correct for windage again at 100 but leave elevation alone. It should be hitting about 2.5 inches high with 55 grain ammo and about 1.5 inches high with 77 grain ammo.
    [​IMG]
    [​IMG]
     
  13. Alaskapopo

    Alaskapopo
    Expand Collapse
    NRA ENDOWMENT

    Joined:
    Feb 6, 2000
    6,545
    2
    Location:
    Alaska