50 yards far enough?

Discussion in 'Bolt Guns/Precision Rifles' started by EMN83, Sep 5, 2011.

  1. EMN83

    EMN83 XDTalk 30K Member

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    so, to make a long story short, the easiest range for me to get to only goes to 50 yards. my question is, given that I have the ballistics data for my ammo, is that acceptable for me for sighting in my rifle for a 200 yard zero?
     
  2. rayikeo2

    rayikeo2 XDTalk 4K Member

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    The answer is yes, it will work for sighting in your rifle for 200 yards. Several pieces of information will be necessary to get it exact. 1) bullet wt in grains. 2) Velosity in Feet per second. 3 Bullet co-efficientcy number. I have some of the charts in the back of my reloading book for referance.

    To make a long story short you can get it pretty close by seighting in the bullet impact between 1/2 and 3/4" high at 50 yards. Remember one minute of angle at 50 yards = 1/2 inch. Example, if you are shooting 1" left at 50 yards the impact at 100 yards will be double or 2" left. Make your adjustments accordingly. If you furnish the above info I can get you more precise information.
     
  3. EMN83

    EMN83 XDTalk 30K Member

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    There's the numbers for what will be my hunting ammo:

    Bullet weight 150 grains

    muzzle velocity 2820 fps

    ballistic coefficient: .415
     
  4. rayikeo2

    rayikeo2 XDTalk 4K Member

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    Give 1 more item, that is the cal of the bullet.:cool:
     
  5. jon45xdtac

    jon45xdtac XDTalk 500 Member

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    I would agree that using the ballistics data would get you pretty close for a 200 yard zero... but I personally wouldn't feel comfortable using that for hunting longer range, etc, until I actually was able to get some long range shooting time in to make sure everything functions the way you expect it to. Basically just verifying that the ballistics data that you have matches what your gun and ammo selection is actually doing.

    Just my 2 cents.
     
  6. wreckerman5357

    wreckerman5357 XDTalk 100 Member

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    Fifty yards is fine for a sight in, but you are going to need to practice at the ranges you are going to shoot when hunting. I zero my rifle by first sighting them in to Lou.t of aim at 25 yards, which puts them at roughly point of aim at 100 yards because of how bullet trajectory works. Next I zero them to shoot however high I need them to shoot at 100 yards for them to shoot to point of aim at maximum point blank range. For example, I sight my Howa .30-06 in 2.7" high at 100 yards and the 165 grain bullet hits point of aim at the load's MPBR of 273 yards. Included is a link explaing this concept including a trajectory table for various loads.

    Rifle Trajectory Table
     
  7. EMN83

    EMN83 XDTalk 30K Member

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    Doh, wow, score one for me not thinking: 308 win


    I'm looking at my schedule so I can open things up, I know where there is a range with 100 and 200 yard ranges, I just need the time. 50 is my initial, just to make sure the rifle shoots and is close to being on, then I plan on making a trip to the other range, if I get the time, to zero things for real. worst case scenerio, I put off rifle hunting this year, and stick with my 12guage and hunt in a different area. Thanks though
     
  8. rayikeo2

    rayikeo2 XDTalk 4K Member

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    From information provided in post #2 150 gr, vel 2820, Co-eff 415

    Using a rifle with a telescope mounted 1 1/2" above bore =
    from chart bullet trajectry.

    Muzzel = (-1 1/2 ")
    50 yds = (dead center)
    100 yds = + 1.8"
    200 yds = (dead center again)
    300 yds = (-8.1")
    400 yds = (-23.6")
    500 yds = (- 47.6")

    This information will be very close. The bullet starts from the muzzel 1 1/2 " low, rises at 50 yards to dead center, continues rise at 100 yds to the 1.8" high, begins to fall down to dead center at 200 yards, continues to drop to -8.1 at 300, more drop to 23.6 at 400 yds to 4 foot low at 500 yds. Some varriance may occur but if yoy set dead center at 50 yards your going to be very close. Verify whenever you get to a longer range.
     
  9. EMN83

    EMN83 XDTalk 30K Member

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    Thanks!! I will be verifying as soon as I can
     
  10. rayikeo2

    rayikeo2 XDTalk 4K Member

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    Note to remember, If you get the 50 yd set at dead center, all the others will auotomacly fall into place. There will be no need to change any adjustments unless it needs to be slightly tweked. If you get to a 100 ys target range and your hits are 1.8" high that veifies everything. Same if you go to a 200 ys range and your bullets should already be hitting dead center without any adjustments. However due to unforseen variables some adjustments may be necessary. Good shooting!
     
  11. EMN83

    EMN83 XDTalk 30K Member

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    Thank you Very Much!!
     
  12. EMN83

    EMN83 XDTalk 30K Member

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    Thanks for the info. whoa, it's going to be interesting when I get my rifle to the range, hopefully in the next week or so
     
  13. wreckerman5357

    wreckerman5357 XDTalk 100 Member

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    Good luck and have fun!
     
  14. EMN83

    EMN83 XDTalk 30K Member

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    when I go, pics will be posted
     
  15. Groo

    Groo XDTalk 10K Member

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    the most important thing to check with that chart is the height above bore axis. That chart assumes it is 1 1/2". if it is different, everything will be off.
     

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