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50 yards far enough?

This is a discussion on 50 yards far enough? within the Bolt Guns/Precision Rifles forums, part of the Long Gun Talk category; 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 ...


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Old 09-05-2011, 04:48 PM   #1
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50 yards far enough?

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?
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Old 09-05-2011, 05:34 PM   #2
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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.
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Old 09-05-2011, 05:57 PM   #3
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Originally Posted by rayikeo2 View Post
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.

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

Bullet weight 150 grains

muzzle velocity 2820 fps

ballistic coefficient: .415
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Old 09-05-2011, 06:19 PM   #4
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Give 1 more item, that is the cal of the bullet.
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Old 09-05-2011, 06:38 PM   #5
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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.
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Old 09-05-2011, 06:53 PM   #6
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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
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Old 09-05-2011, 06:54 PM   #7
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Quote:
Originally Posted by rayikeo2 View Post
Give 1 more item, that is the cal of the bullet.

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


Quote:
Originally Posted by jon45xdtac View Post
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.
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
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Old 09-05-2011, 07:08 PM   #8
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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.
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Old 09-05-2011, 07:28 PM   #9
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Quote:
Originally Posted by rayikeo2 View Post
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.

Thanks!! I will be verifying as soon as I can
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Old 09-05-2011, 07:40 PM   #10
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Originally Posted by EMN83 View Post
Thanks!! I will be verifying as soon as I can
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!
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