Click Formula > Optics, Mounts, and Sights

Posted: 7/25/2005 7:28:48 PM EDT

Kudos on a great site! This is my first post and I hate its not about an AR-15, but maybe you guys can help. Im a big fan of long range shooting and did this for a while and knew most of the tables and formulas. When I was in College time was hard to come by to go practice my passion and when I left spare time was practically non exisitant. During that time I placed a lot of items in storage because I had to live with my parents for a while and now Im married and in the process of gathering things from storage and I have yet to bring my labrary home yet. All this in a time frame of 2 years.

I found a great place locally for long range shooting and went today and made a range card and found an array of yardages to shoot. I need to know the formula to find the number of clicks up or down for an accurate point of impact. Im shooting a Remington 700PSS, Leupold VX 4.5-14x50 LR Tactical with 1/4 moa per click, Federal Gold 168gr 2700FPS. I hope someone can help cuse Im all hyped up and want to place clicks on the range card for specific ranges from 100 yard zero. It will be several weeks before I can make it up to get the rest of my things from storage.

Example:

Target is 625yds away. My zero is at 100yds. How many clicks do I need to make to hit exactly where my crosshairs are!

Thanks
Do you know SWFA???

Posted: 7/25/2005 7:42:55 PM EDT

[#1]

Where in MS are you located? BTW, welcome to ARFCOM!

Posted: 7/25/2005 8:02:45 PM EDT

[#2]

In Stonewall about 12 miles south of Meridian.

Posted: 7/25/2005 8:45:03 PM EDT

[#3]

This might be what you're looking for. www.beartoothbullets.com/rescources/calculators/balistics/index.htm

Posted: 7/25/2005 9:01:25 PM EDT

[#4]

Hey Thats a great site! I cant wait to play around with that! Greatly appreciated. Still open for discussion.

Posted: 7/25/2005 9:22:15 PM EDT

[#5]

There is no simple forumula. You need to use a ballistic calculator. The methods for modeling external ballistics through atmosphere use interative numeric methods over a set of differential equations. The most common is a Point-Mass model and a Runga-Kutta method.

That aside, once you have access to the software, you need the following inputs to accurately compute trajectory: atmospheric station pressure / temp (ie, == density altitude), sight above bore distance, muzzle velocity, bullet BC(s), zero distance, incline, and wind.

Here is a data set for 5000' ICAO density alttiude, 2.0" sight over bore, 168SMK 2700fps, 100 yard zero, wind value 10mph


168 SMK F: 2700fps 100yd 5000'
elev(MOA) RANGE wind 
    4.00   25  0.25 
    0.75   50  0.25 
    0.00   75  0.50 
    0.00  100  0.50 
    0.25  125  0.75 
    0.75  150  1.00 
    1.00  175  1.00 
    1.75  200  1.25 
    2.25  225  1.50 
    2.75  250  1.50 
    3.50  275  1.75 
    4.25  300  2.00 
    4.75  325  2.00 
    5.50  350  2.25 
    6.25  375  2.50 
    7.00  400  2.50 
    7.75  425  2.75 
    8.75  450  3.00 
    9.50  475  3.25 
   10.50  500  3.50 
   11.25  525  3.50 
   12.25  550  3.75 
   13.00  575  4.00 
   14.00  600  4.25 
   15.00  625  4.50 
   16.00  650  4.75 
   17.25  675  5.00 
   18.25  700  5.25 
   19.25  725  5.50 
   20.50  750  5.75 
   21.75  775  6.00 
   23.00  800  6.25

-z

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