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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 08-16-2010, 8:36 PM
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Default 7.62x39 zeroed at 50 yards: how much drop at 100 yards?

If I zero my rifle at 50yards, (shooting a 7.62x39 AK) and then I move the target out to 100 yards and aim at the same point, how far below my aim point should I expect the rounds to go? Conversely, how high would a round be if I moved the target in to 25yards?

I will eventually get to the range to see for myself, but I was just curious if anyone had this info offhand. Thanks!
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Old 08-16-2010, 8:44 PM
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For a 100 yard zero..........

The data I put into a ballistics calculator gave me a bullet drop of .50" at 100 from a 50yd zero.
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Old 08-16-2010, 9:00 PM
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In my experience, far less than the accuracy of my rifle with iron sights.

Re your location, the way I heard it from Louie the Lobster was "I left my harp in Sam the Clam's Disco"
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Old 08-16-2010, 9:53 PM
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Old 08-16-2010, 10:39 PM
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Depends on the height of the sights above the barrel.
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Old 08-16-2010, 10:52 PM
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Quote:
Originally Posted by elsolo View Post
Depends on the height of the sights above the barrel.
It is an AK, about 2" I think.
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Old 08-16-2010, 11:05 PM
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Edit: sorry thats with 3 inches above the bore.
If you zero at 50 yards it might look like this
50 yard zero:
25 yard: 1" low
50: dead on
100: 1" high
200: 2" low
250: 7" low
300: 14" low

For 2 inches above the bore
50 yard zero:
25 yard: .8 low
50: dead on
100: .2 high
200: 5.9" low
250: 12.7" low
300: 22.4" low
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Old 08-16-2010, 11:36 PM
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With a 2" sight height and a 50yd near zero, your far zero is at about 105yds.
Look at the "Path to LOS(line of sight)" column.


Code:
Tabular trajectory data at Non-Std. Atmosphere
 Gunsite altitude : 3000 ft.
 Air density      : 0.069983 lb./ft³
-------------------------------------------------------------------------------------
 Gun / Ammunition : ???????
 Bullet           : .310, 123, Hornady SP 3140
 Bullet weight    : 123 grains or 7.97 Grams
 Muzzle velocity  : 2300 fps
 Crosswind speed  : 10 Mph 
 Ballistic Coefficient(s) (G1): 
 C1=0.252@V>0 fps;


 Optimum trajectory information : 
 Optimum sight-in range (X) = 138 Yds. 
 with max. ordinate above LOS at range (M)= 89 Yds.
 and max. point blank range (P)= 156 Yds.
-------------------------------------------------------------------------------------
 Sight-in clicks, 1 click = 1.0 cm/100 m or 0.394 in/100 m
 Height of sight above bore axis = 5.08 cm or 2.00 inch
 Gun is zeroed-in at 50 yds,
 by sighting-in at level firing
-------------------------------------------------------------------------------------
 Range  Velo Time of  Energy   Path    Deflection    Total  Sight correction  Target
        city  flight            to    at crosswind    drop   for setting new   lead
                                LOS    of 10.0 Mph             zero range     3 fps
-------------------------------------------------------------------------------------
·Yards   fps     s    ft.lbs.   in.    in.     MOA     in.   Clicks     MOA     yds ·
-------------------------------------------------------------------------------------
|    0  2300  0.0000   1445    -2.0    0.0   -----     0.0   ------    -----    0.00
|   10  2270  0.0132   1408    -1.5    0.0    0.23     0.0    +40.6   +13.94    0.01
|   20  2241  0.0265   1371    -1.0    0.1    0.39     0.1    +13.7    +4.72    0.03
|   30  2211  0.0401   1335    -0.6    0.2    0.54     0.3     +5.4    +1.87    0.04
|   40  2182  0.0538   1301    -0.3    0.3    0.69     0.5     +1.8    +0.61    0.05
X   50  2153  0.0677   1266     0.0    0.4    0.84     0.9      0.0     0.00    0.07
|   60  2125  0.0818   1233    +0.2    0.6    0.99     1.3     -0.8    -0.29    0.08
|   70  2096  0.0960   1200    +0.3    0.8    1.13     1.7     -1.1    -0.39    0.09
M   78  2073  0.1075   1174    +0.3    1.0    1.24     2.2     -1.1    -0.39    0.11
|   80  2068  0.1104   1168    +0.3    1.1    1.27     2.3     -1.1    -0.37    0.11
|   90  2040  0.1250   1136    +0.3    1.3    1.41     2.9     -0.8    -0.28    0.12
|  100  2012  0.1397   1105    +0.1    1.6    1.55     3.6     -0.4    -0.12    0.14
|  110  1984  0.1545   1075    -0.1    1.9    1.69     4.4     +0.2    +0.07    0.15
|  120  1957  0.1694   1046    -0.4    2.3    1.81     5.3     +0.9    +0.30    0.17
|  130  1929  0.1846   1016    -0.8    2.6    1.94     6.2     +1.6    +0.56    0.18
P  135  1916  0.1923   1002    -1.0    2.9    2.02     6.7     +2.0    +0.70    0.19
|  140  1902  0.2001    988    -1.2    3.1    2.10     7.3     +2.5    +0.84    0.20
|  150  1875  0.2159    960    -1.8    3.6    2.27     8.4     +3.4    +1.16    0.21
|  160  1849  0.2321    933    -2.5    4.1    2.46     9.7     +4.4    +1.50    0.23
|  170  1823  0.2485    907    -3.3    4.7    2.65    11.0     +5.4    +1.86    0.24
|  180  1797  0.2653    882    -4.2    5.4    2.85    12.5     +6.5    +2.23    0.26
|  190  1771  0.2823    857    -5.2    6.1    3.05    14.1     +7.6    +2.63    0.28
|  200  1746  0.2995    833    -6.4    6.8    3.25    15.8     +8.8    +3.04    0.29
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Last edited by ar15barrels; 08-16-2010 at 11:38 PM..
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  #9  
Old 08-17-2010, 6:59 AM
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Google search Winchester Ballistics Calculator for a free online one to play around with.
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Old 08-17-2010, 7:18 AM
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Personal experience using Wolf Military Classic in my Yugo underfolder, is that the rear iron sight set to "0" works at 50 yds, and needs to be moved to "2" for 100 yds. Think Yugo ammo may have a bit more velocity than Wolf.
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Old 08-17-2010, 7:45 AM
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Thanks for all the info guys, much appreciated!
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Old 08-17-2010, 1:43 PM
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Use this one. It's the bestest.

http://www.handloads.com/calc/
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Old 08-17-2010, 1:49 PM
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Quote:
Originally Posted by olhunter View Post
JBM is the best by far...

http://www.jbmballistics.com/ballist...culators.shtml
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