scope adjustment help

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Moose02

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Ok if you have a scope that has 1/4moa increments i know that the bullet impact will move 1/4moa at 100 yard, 1/2moa at 200yrds, 3/4 at 300 yrds so on. How do you figure out your adjustment if say your target is at 160yrds are you measuring by 1/2 moa or something else? thanks all
 
Check out the program called 'load from a disk'

You can do a whole bunch of ballistics calculations, including a 'click graph' where it shows you how many clicks it would take a a specific distance, really handy.
 
for example

a 308 168 gr. @ 2600 fps

zero @ 100y

drop @ 160y = 1.1 moa or 1.9"


one click (.25 moa) should move it around .4"??


​
 
Moose02 said:
Ok if you have a scope that has 1/4moa increments i know that the bullet impact will move 1/4moa at 100 yard, 1/2moa at 200yrds, 3/4 at 300 yrds so on. How do you figure out your adjustment if say your target is at 160yrds are you measuring by 1/2 moa or something else? thanks all
Click to expand...

A minute is a minute.... adjusting a half minute at 100 or 1000 is the same, but the size of that minute gets bigger with distance. Think of it like a cone... one that is roughly 1 inch wide at 100 and 2" at 200.

(distance in hundreds of yards) X (Scope adjustment increment) = POI

300 yds = 3.................. increment is .25

3 X.25 = ~.75 inches


if you're wanting to adjust for 160, then it is 1.6 X .25 = .4 inches

At 100 yards, a quarter minute click will move about a quarter inch

at 200, it will move about a half inch

at 300, roughly 3/4 of an inch etc.

For adjustments that are finer than your scope adujstments, use your reticle dot... if you have an 1/8th minute dot, then you can use dot width hold-off to make finite adjustments.
 
Last edited:
No, they move up 1/4 MOA no matter what distance. At 100 yards 1 MOA is 1 inch (more or less). At 200 it is 2 inches, 300=3" and so on.

Most guys know their trajectory at given distances (ie 2" high at 100 is dead on at 300 and 6" low at 300 with a certain rifle and load). If you want to know how many "clicks" to go up at a given distance you should shoot a lot and figure out your trajectory. Once you've got that, you'll know that at 150 yards 1.5" is 1.5 MOA and thus if you have to come up 3 inches you need to go 8 clicks, and so on.

Clear as mud?
 
BigUglyMan said:
Most guys know their trajectory at given distances (ie 2" high at 100 is dead on at 300 and 6" low at 300 with a certain rifle and load)
Click to expand...

impressive, whats drop @ 400 :D
 
todbartell said:
impressive, whats drop @ 400 :D
Click to expand...

I do this, then I shoot the danged rifle!
Clicks, MOA, drop in inches, everything is there on paper.
Then get to the rasnge and see if the rifle will do it.....
Cat
Gun / Ammunition : .303 British (SAAMI)
Bullet : .311, 174, SRA HPBT MatchK 2315
Bullet weight : 174 grains or 11.28 Grams
Muzzle velocity : 2461 fps
Crosswind speed : 1 Mph
Ballistic Coefficient(s) (G1):
C1=0.490@V>2200 fps;
C2=0.484@V>1800 fps;
C3=0.472@V>0 fps;


Optimum trajectory information :
Optimum sight-in range (X) = 170 Yds.
with max. ordinate above LOS at range (M)= 104 Yds.
and max. point blank range (P)= 196 Yds.
-------------------------------------------------------------------------------------
Sight-in clicks, 1 click = 0.915 cm/100 yd. or 0.36 in/100 yd.
Height of sight above bore axis = 5.0 cm or 1.969 inch
Gun is zeroed-in at 500 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 1.0 Mph zero range 33 fps
-------------------------------------------------------------------------------------
·Yards fps s ft.lbs. in. in. MOA in. Clicks MOA yds ·
-------------------------------------------------------------------------------------
| 0 2461 0.0000 2340 -2.0 0.0 ----- 0.0 ------ ----- 0.00
| 25 2417 0.0305 2257 +2.6 0.0 0.00 0.2 -29.4 -10.10 0.33
| 50 2374 0.0618 2177 +6.9 0.0 0.03 0.7 -38.2 -13.15 0.68
| 75 2331 0.0937 2099 +10.7 0.0 0.05 1.7 -39.8 -13.68 1.02
| 100 2289 0.1263 2024 +14.2 0.1 0.07 3.0 -39.4 -13.55 1.38
| 125 2247 0.1596 1950 +17.2 0.1 0.10 4.8 -38.2 -13.16 1.74
| 150 2205 0.1934 1879 +19.8 0.2 0.12 7.0 -36.7 -12.62 2.12
| 175 2164 0.2279 1809 +22.0 0.3 0.14 9.6 -34.8 -11.99 2.49
| 200 2123 0.2629 1741 +23.7 0.3 0.16 12.7 -32.8 -11.29 2.88
| 225 2082 0.2986 1675 +24.9 0.4 0.18 16.3 -30.7 -10.55 3.27
| 250 2042 0.3348 1611 +25.6 0.5 0.20 20.3 -28.4 -9.78 3.66
M 275 2002 0.3715 1548 +25.8 0.6 0.22 24.9 -26.1 -8.97 4.06
| 300 1962 0.4085 1488 +25.6 0.8 0.24 29.9 -23.7 -8.15 4.47
| 325 1923 0.4467 1429 +24.8 0.9 0.26 35.5 -21.2 -7.28 4.88
| 350 1885 0.4860 1372 +23.3 1.1 0.29 41.8 -18.5 -6.36 5.31
| 375 1847 0.5264 1318 +21.2 1.2 0.31 48.7 -15.7 -5.40 5.76
| 400 1810 0.5678 1265 +18.4 1.4 0.34 56.3 -12.8 -4.39 6.21
| 425 1772 0.6101 1214 +14.9 1.6 0.37 64.6 -9.7 -3.34 6.67
| 450 1736 0.6535 1164 +10.7 1.9 0.40 73.6 -6.6 -2.26 7.15
| 475 1699 0.6977 1116 +5.7 2.1 0.42 83.4 -3.3 -1.15 7.63
X 500 1664 0.7428 1069 0.0 2.4 0.45 93.9 0.0 0.00 8.12
P 506 1655 0.7537 1058 -1.5 2.4 0.46 96.5 +0.8 +0.28 8.24
| 525 1628 0.7887 1024 -6.5 2.6 0.48 105.1 +3.4 +1.18 8.63
| 550 1594 0.8354 981 -13.7 2.9 0.51 117.2 +6.9 +2.38 9.14
| 575 1560 0.8828 940 -21.8 3.2 0.54 130.0 +10.5 +3.61 9.65
| 600 1526 0.9310 899 -30.6 3.5 0.56 143.6 +14.1 +4.87 10.18
| 625 1493 0.9799 862 -40.3 3.9 0.59 158.1 +17.9 +6.15 10.72
| 650 1461 1.0301 825 -50.9 4.2 0.62 173.6 +21.8 +7.48 11.27
| 675 1430 1.0819 790 -62.8 4.6 0.65 190.2 +25.8 +8.89 11.83
| 700 1400 1.1351 757 -75.9 5.0 0.68 208.1 +30.1 +10.35 12.41
| 725 1371 1.1895 726 -90.2 5.4 0.72 227.1 +34.5 +11.87 13.01
| 750 1343 1.2450 697 -105.6 5.9 0.75 247.4 +39.1 +13.44 13.62
| 775 1316 1.3016 669 -122.2 6.3 0.78 268.8 +43.8 +15.06 14.23
| 800 1289 1.3592 642 -140.0 6.8 0.81 291.4 +48.6 +16.72 14.86
| 825 1263 1.4176 617 -159.0 7.3 0.85 315.2 +53.5 +18.41 15.50
| 850 1239 1.4775 593 -179.6 7.8 0.88 340.5 +58.6 +20.17 16.16
| 875 1215 1.5386 571 -201.6 8.4 0.92 367.3 +63.9 +22.00 16.83
| 900 1193 1.6010 550 -225.2 9.0 0.95 395.7 +69.5 +23.89 17.51
| 925 1172 1.6644 531 -250.3 9.5 0.99 425.6 +75.1 +25.84 18.20
| 950 1152 1.7288 513 -277.0 10.1 1.02 457.1 +80.9 +27.84 18.91
| 975 1133 1.7946 496 -305.5 10.8 1.06 490.4 +87.0 +29.91 19.63
| 1000 1116 1.8612 481 -335.6 11.4 1.09 525.2 +93.1 +32.04 20.35
-------------------------------------------------------------------------------------
M = Peak vs. L.O.S, X = Set Zero, P = Max. Point Blank Range
Elevation above Angle of Site (0.0 deg.) = 0.3050 deg.
 
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