Help with 7.62x39 bullet drop.


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beerslurpy
March 11, 2005, 08:04 PM
Mostly using ulyanovsk nipple tip "match" ammo, but I dont expect any of the other 122-123 grain fmj rounds are much different.

How much drop can I expect out to 50, 100, 150, 200,300, 400 yards etc from an AK? I just need to know the appropriate elevation settings to dial in on my PK-AS.

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rbernie
March 11, 2005, 08:26 PM
Name: 7.62x39 Generic External Ballistics
Ballistic Coeff: 0.300
Bullet Weight: 123
Velocity: 2400
Target Distance: 198 (MPBR)
Scope Height: 1.500
Temperature: 70
Altitude: 500

Ballistic Data
~~~~~~~~~~~~~~~
Range Elevation Velocity Energy ETA Drop Max Y 10mph Wind Deflect
0 yds -1.50 in 2400 fps 1573 fpe 0.000 sec 0.00 in -1.50 in 0.00 in
25 yds 0.24 in 2333 fps 1486 fpe 0.032 sec 0.19 in -0.55 in 0.08 in
50 yds 1.58 in 2266 fps 1402 fpe 0.064 sec 0.79 in -0.40 in 0.35 in
75 yds 2.50 in 2201 fps 1323 fpe 0.098 sec 1.81 in -0.13 in 0.79 in
100 yds 2.96 in 2137 fps 1247 fpe 0.133 sec 3.28 in 0.26 in 1.39 in
125 yds 2.95 in 2073 fps 1174 fpe 0.169 sec 5.22 in 0.78 in 2.16 in
150 yds 2.46 in 2011 fps 1105 fpe 0.205 sec 7.65 in 1.44 in 3.08 in
175 yds 1.43 in 1950 fps 1038 fpe 0.243 sec 10.62 in 2.26 in 4.21 in
200 yds -0.15 in 1890 fps 975 fpe 0.281 sec 14.13 in 3.25 in 5.52 in
225 yds -2.38 in 1831 fps 916 fpe 0.322 sec 18.29 in 4.43 in 7.12 in
250 yds -5.29 in 1774 fps 859 fpe 0.364 sec 23.14 in 5.83 in 9.00 in
275 yds -8.91 in 1718 fps 806 fpe 0.407 sec 28.70 in 7.45 in 11.14 in
300 yds -13.27 in 1664 fps 756 fpe 0.452 sec 34.99 in 9.32 in 13.51 in

Bobarino
March 11, 2005, 08:27 PM
according to the ballistics charts in G&A magazine, typical bullet drop goes something like this with a 200yd zero:

100 yds = +~ 3.5"
200 yds = 0
300 yds = -~ 14"
400 yds = -~ 44"
500 yds = -~ 95"

give or take and inch or two here or there.

Bobby

beerslurpy
March 11, 2005, 08:37 PM
So basically just aim at the head no matter what?

Out to 100 yards, I will hit the head. Out beyond it, I will hit somewhere in the torso thanks to bullet drop.

This is a fairly accurate rifle by the way. Definitely under 3 moa. Unfortunately I have no idea how far under 3 moa since that is the size of my scope's dot.

I am pretty amazed that it only drops a foot out to 300 yards, tho after that it looks pretty horrible.

Not that I'm planning on shooting anyone, just curious where the bullets are going.

theCZ
March 11, 2005, 08:52 PM
I've found that the charts and what actually happens are two different things. Just think of all the variables that go into calculating these figures. I looked at the charts, and then found out how much drop my .223 was actually doing. Even at 300 yards, the charts said the bullet should drop 2" more than it did, which could easily have meant a miss on a varmint. You'll feel more confident if you test it out for yourself.

DMK
March 11, 2005, 08:59 PM
The very cool trajectory chart that came with my SKS Tech Sight (http://www.tech-sights.com/) agrees with the 200 yard zero numbers posted by Bobarino, with 100 yards being the highest point in the curve (meaning that out to 220 or so yards you are no more than +/- 3" of POA).

The chart also shows that the 200 yard zero also has a close range zero crossover at 20 yards for those of us without access to a 200 yard rifle range.

beerslurpy
March 11, 2005, 09:23 PM
Unfortunately the nearby 200 yard range is rarely open (or is occupied with a tourney of some sort) so I cant exactly test this out. Also, testing precisely how much drop I am getting with a 3 moa dot is kind of futile. I just wanted a general idea- my gun is neither scoped nor capable of long range varmint kills.

rbernie
March 11, 2005, 10:00 PM
Three inches high at 100 yards will get you spot on at 200 yards.

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