I want to create a ballistics chart!


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Extremely Pro Gun
July 29, 2009, 12:56 AM
Ok so I got a new BAR 300 mag and a burris scope w/ 1/4 moa adjustments per click. I want to zero at 100 and compensate for bullet drop using the moa adjustments. I want to make a chart giving me in moas the drop of my bullet in intervals of 10 yards to about 500. If the ballistic chart gives me drop at 200 yards can I just use a proportion to figure out the others? Is there other formulas? How should I do this?

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cameron.personal
July 29, 2009, 01:05 AM
http://www.jbmballistics.com/calculations/calculations.html check out Trajectory and Trajectory Cards

Cameron

Extremely Pro Gun
July 29, 2009, 01:15 AM
Hey! This looks good, but how would it know what caliber, ammo, gun you are using?

http://bushnell.com/products/rangefinders/legend-1200-arc/

taliv
July 29, 2009, 09:30 AM
just google 'ballistic calculator'. you will need to know the BC and velocity of your projectile to get in the ballpark plus some stuff like how high your sights are over the bore. it's not hard to figure out. if you can't find the BC and velocity on the box of ammo, you can call the manufacturer and ask. just a caveat: in my experience with chornographs, actual velocity is typically appreciably shy of published/claimed velocities, so i'd err on the low side if you're not hitting where you think you should

c5_nc
July 29, 2009, 12:16 PM
I use the modern balistics calculator. It rocks, especially for shooting multiple loads from the same gun. Like in 308 I may have 147gn surplus for plinking, 180gn SPs for hunting, and 175 match ammo for long range, I can zero with one and get come up charts for each load based on my base load's trajectory (since they will all be different at zero distance) I can calculate for this and just have a mil/moa chart handy. I move the data to a spreedsheet for better formating and laminate them.

rcmodel
July 29, 2009, 01:34 PM
You would be better served for hunting by sighting in with a 200 - 250 yards zero with the load you intend to use, and learning the trajectory figures beyond that.

A deer or antelope will run into the next county while you are counting clicks.

rc

cameron.personal
July 29, 2009, 01:51 PM
Hey! This looks good, but how would it know what caliber, ammo, gun you are using?

Did you actually look at the web page?

You sellect your round from the list, this gives you BC, then input the variable such as: muzzle velocity, sight over bore, altitude, temp etc and it produces a chart for you.

Very easy.

Cameron

Alagator
July 29, 2009, 05:45 PM
You need to know the muzzle velocity and the bc of the round you are using. Go to the manufacturer's website, or if the box shows velocity and trajectory info, you can figure the bc using
http://www.jbmballistics.com/~jbm/cgi-bin/jbmbcv-5.0.cgi

once you have the muzzle velocity and the bc, you can go here
http://www.biggameinfo.com/BalCalc.aspx
to figure the clicks setting the zero at 100. HOWEVER, if you are hunting with it, I heartily concur with the previous poster who said you will be clicking while the animal is departing. Here is what I do, and it works for me. Just be patient while we go through this. Say you are using Hornady 150 grain interbonds. Their website gives a muzzle velocity of 3275 fps, and a 100 yard velocity of 3032. Under the bullet listing, they give a bc of 0.415 (if you plug those two velocities into the JBM calculator, you get 0.422, but let's stick with Hornady) Now go back to the ballistics calculator, but go advanced so you get this page
http://www.biggameinfo.com/BalCalcAdv.aspx
You will be on the load definition page. Plug in the muzzle velocity, the bc, and the 150 grains. Now click on the Preferences box-- on that page you can set the interval for 10 and the vital zone radius for 4 (this gives an 8 inch vital zone diameter) Now hit the Calculate button. It should print out a chart, but YOU ARE NOT FINISHED. The top of the chart will include this info--Max Point blank range is 356 yds when zeroed at 304 yds. Current Zero is 275 yds.-- Now go back to the Load Definition page and set the zero range to 304 and the zero height to 0, and hit Calculate again. Now the top of the chart should read --Max Point blank range is 356 yds when zeroed at 304 yds. Current Zero is 304 yds.--This chart now shows that if you zero that rifle at 3.1 high at 100 yards, then all the way to 356 yards you will never be more tha 4 inches higher or lower that the crosshair. I use a 3 inch radius vital zone for deer. If you are after bigger animals, you can use 4 or even 5. Just hold in the middle of the vital zone and shoot. No fiddling with knobs and trying to remember the count as the animal evaporates. Now, a grain of salt-- all this is computer stuff-- you need to see what you and your rifle actually do at various distances under hunting conditions-- my 270 can kill a deer a lot farther off than I can shoot it. I hope this helps-- this calculator website is good for wasting time, but if you play with the part that says Target Speed and Angle, you are really setting the wind speed and angle-- it will show you wind drift-- bottom line... no long shots on windy days .. your laser can tell you range, but not windspeed. Good Hunting!

Dr. Tad Hussein Winslow
July 29, 2009, 05:49 PM
Very nice response Alagator; cannot improve upon that.

There are lots of free ballistic programs available online, and some better ones you pay for. Download 'em, learn 'em, love 'em. :)

sohcgt2
July 29, 2009, 06:58 PM
Federal Cartridge co. offers an interactive catalog that can provide baseline ballistics for any Federal product.

FuzzyBunny
July 29, 2009, 07:06 PM
I'm interested in bullet drop out of a HK91 NATO.
Is there a chart already done? Does not have to ne spot on just ball park

Bwana John
July 29, 2009, 07:36 PM
All you guys that say "look it up on online ballistic charts" need to go shoot the rifle at all the distances required.

You will find that real life doesn't always match "the chart".:banghead:

AS you are actually shooting to test trajectory, if you cant keep it in a ~6" group it is unethical to shoot the animal at that range or farther.:cuss:

I would recommend sighting the rifle at 200 yds, giving a ~240 yard "point blank range".
If the animal is farther you need to get closer.:cool:

matrem
July 29, 2009, 07:54 PM
"I want to make a chart giving me in moas the drop of my bullet in intervals of 10 yards to about 500."
Wow!
I'll never knock striving for excellence..But Wow!

Art Eatman
July 29, 2009, 08:47 PM
I'd go with rcmodel's view. That gets you about 4" low at 300 and maybe 16" to 18" low at 400. Figure somewhere near 36" low at 500; maybe 40". You'd have to shoot and find out, to get any closer on the numbers...

After 300 yards, wind is a bunch more of a problem than an inch or two of elevation, up or down.

Uncle Mike
July 29, 2009, 08:48 PM
A deer or antelope will run into the next county while you are counting clicks.


Tell them rc... with all this 'sniper' stuff on the tube now days we here about counting clicks in the deer stand all the time....HAHAHAHA oh my goooodness!

Guys, the modern deer caliber(30-06, Hornady Light Mag 165gr SST, for example), high power rifle shoots flat enough that if you sight in at.... say 200y, at 300y you only drop 6.7" and 19.5" at 400y and so on...

How FAR are you going to shoot? If you can't remember a couple of hold overs.....
Anyone can figure out what 6.7" looks like on the side of a deer at most yardages out to 600 or so yards, some can do it even further.

By the time you get done fiddling with your super sniper shooter movie dope, cranking, counting clicks, dropping your gloves, unthawing your finger tips....BANG, ol' bubba done flung a mental hold over on your prize deer and is fixin' on guttin' it.

Whoooops......

Write your 'hold overs' and windage 'hold offs' down on something, put in pocket, tape to side of buttstock, what ever... devote too memory!

Happy hunting-

JimKirk
July 30, 2009, 12:09 AM
Alagator
You're using more steps than needed.
http://www.jbmballistics.com/~jbm/cgi-bin/jbmtraj-5.0.cgi
Get the Velocity and BC( or the list of built in bullets).
Change the info that applies to you(sight height, temp, altitude....)
Vital Zone....This is important...but your choice.. 4" or whatever you wish
Pick the range increments in yards or meters ... every 10 yards
Now down in the left hand set of check boxes...third down ..
check .....Zero at Max Point Blank
Calculate
Jimmy K

It will give a chart with what you need to sight in
Trajectory
Input Data
Ballistic Coefficient: 0.437 G1 Caliber: 0.257 in
Bullet Weight: 115.0 gr

Muzzle Velocity: 3000.0 ft/s Distance to Chronograph: 10.0 ft

Sight Height: 1.50 in Sight Offset: 0.00 in
Zero Height: 0.00 in Zero Offset: 0.00 in
Windage: 0.000 MOA Elevation: 0.000 MOA
Line Of Sight Angle: 0.0 deg Cant Angle: 0.0 deg

Wind Speed: 10.0 mph Wind Angle: 90.0 deg
Target Speed: 10.0 mph Target Angle: 90.0 deg

Temperature: 59.0 F Pressure: 29.92 in Hg
Humidity: 0.0 % Altitude: 0.0 ft

Vital Zone Radius: 4.0 in

Std. Atmosphere at Altitude: No Pressure is Corrected: Yes
Zero at Max. Point Blank Range: Yes Target Relative Drops: Yes
Mark Sound Barrier Crossing: No Include Extra Rows: No
Round Output to Whole Numbers: No
Output Data
Elevation: 6.471 MOA Windage: 0.000 MOA

Atmospheric Density: 0.07647 lb/ft Speed of Sound: 1116.5 ft/s

Maximum PBR: 328 yd Maximum PBR Zero: 280 yd
Range of Maximum Height: 156 yd Energy at Maximum PBR: 1375.1 ft•lbs

Sectional Density: 0.249 lb/in
Calculated Table
Range Drop Drop Windage Windage Velocity Mach Energy Time Lead Lead
(yd) (in) (MOA) (in) (MOA) (ft/s) (none) (ft•lbs) (s) (in) (MOA)
0 -1.5 *** 0.0 *** 3007.6 2.694 2309.4 0.000 0.0 ***
10 -0.8 -8.0 0.0 0.1 2984.9 2.674 2274.7 0.010 1.8 16.8
20 -0.2 -1.1 0.0 0.1 2962.4 2.653 2240.6 0.020 3.5 16.9
30 0.4 1.1 0.1 0.2 2940.0 2.633 2206.8 0.030 5.3 17.0
40 0.9 2.1 0.1 0.3 2917.8 2.613 2173.5 0.041 7.1 17.0
50 1.4 2.7 0.2 0.3 2895.6 2.594 2140.7 0.051 8.9 17.1
60 1.9 2.9 0.2 0.4 2873.6 2.574 2108.2 0.061 10.8 17.2
70 2.3 3.1 0.3 0.5 2851.6 2.554 2076.1 0.072 12.6 17.2
80 2.6 3.2 0.4 0.5 2829.8 2.535 2044.5 0.082 14.5 17.3
90 3.0 3.2 0.6 0.6 2808.1 2.515 2013.2 0.093 16.4 17.4
100 3.3 3.1 0.7 0.7 2786.5 2.496 1982.4 0.104 18.2 17.4
110 3.5 3.0 0.8 0.7 2765.0 2.477 1951.9 0.114 20.1 17.5
120 3.7 2.9 1.0 0.8 2743.6 2.457 1921.8 0.125 22.1 17.6
130 3.8 2.8 1.2 0.9 2722.4 2.438 1892.1 0.136 24.0 17.6
140 3.9 2.7 1.4 0.9 2701.2 2.419 1862.8 0.147 25.9 17.7
150 4.0 2.5 1.6 1.0 2680.1 2.400 1833.9 0.159 27.9 17.8
160 4.0 2.4 1.8 1.1 2659.1 2.382 1805.3 0.170 29.9 17.8
170 4.0 2.2 2.0 1.1 2638.2 2.363 1777.0 0.181 31.9 17.9
180 3.9 2.0 2.3 1.2 2617.5 2.344 1749.1 0.193 33.9 18.0
190 3.7 1.9 2.6 1.3 2596.8 2.326 1721.6 0.204 35.9 18.0
200 3.5 1.7 2.8 1.4 2576.2 2.307 1694.4 0.216 37.9 18.1
210 3.3 1.5 3.1 1.4 2555.7 2.289 1667.6 0.227 40.0 18.2
220 3.0 1.3 3.5 1.5 2535.3 2.271 1641.0 0.239 42.1 18.3
230 2.6 1.1 3.8 1.6 2515.0 2.253 1614.9 0.251 44.2 18.3
240 2.2 0.9 4.1 1.6 2494.8 2.234 1589.0 0.263 46.3 18.4
250 1.7 0.7 4.5 1.7 2474.6 2.216 1563.5 0.275 48.4 18.5
260 1.2 0.4 4.9 1.8 2454.6 2.199 1538.3 0.287 50.5 18.6
270 0.6 0.2 5.3 1.9 2434.7 2.181 1513.4 0.299 52.7 18.6
280 -0.0 -0.0 5.7 2.0 2414.8 2.163 1488.8 0.312 54.9 18.7
290 -0.7 -0.2 6.2 2.0 2395.1 2.145 1464.5 0.324 57.1 18.8
300 -1.5 -0.5 6.6 2.1 2375.4 2.128 1440.6 0.337 59.3 18.9
310 -2.3 -0.7 7.1 2.2 2355.8 2.110 1416.9 0.350 61.5 19.0
320 -3.2 -0.9 7.6 2.3 2336.3 2.093 1393.6 0.362 63.8 19.0
330 -4.1 -1.2 8.1 2.3 2316.9 2.075 1370.5 0.375 66.0 19.1
340 -5.1 -1.4 8.6 2.4 2297.6 2.058 1347.8 0.388 68.3 19.2
350 -6.2 -1.7 9.2 2.5 2278.4 2.041 1325.3 0.401 70.6 19.3
360 -7.3 -1.9 9.8 2.6 2259.3 2.024 1303.2 0.415 73.0 19.4
370 -8.6 -2.2 10.4 2.7 2240.2 2.007 1281.3 0.428 75.3 19.4
380 -9.8 -2.5 11.0 2.8 2221.3 1.990 1259.7 0.441 77.7 19.5
390 -11.2 -2.7 11.6 2.8 2202.4 1.973 1238.4 0.455 80.1 19.6
400 -12.6 -3.0 12.3 2.9 2183.6 1.956 1217.4 0.469 82.5 19.7
410 -14.1 -3.3 12.9 3.0 2164.9 1.939 1196.6 0.482 84.9 19.8
420 -15.7 -3.6 13.6 3.1 2146.3 1.922 1176.1 0.496 87.4 19.9
430 -17.3 -3.8 14.3 3.2 2127.8 1.906 1155.9 0.510 89.8 19.9
440 -19.1 -4.1 15.1 3.3 2109.4 1.889 1136.0 0.525 92.3 20.0
450 -20.9 -4.4 15.8 3.4 2091.0 1.873 1116.3 0.539 94.8 20.1
460 -22.7 -4.7 16.6 3.4 2072.8 1.857 1096.9 0.553 97.4 20.2
470 -24.7 -5.0 17.4 3.5 2054.7 1.840 1077.8 0.568 99.9 20.3
480 -26.7 -5.3 18.2 3.6 2036.6 1.824 1059.0 0.582 102.5 20.4
490 -28.9 -5.6 19.1 3.7 2018.6 1.808 1040.4 0.597 105.1 20.5
500 -31.1 -5.9 20.0 3.8 2000.8 1.792 1022.0 0.612 107.7 20.6

Chart does line up better than this !

bang_bang
July 30, 2009, 12:40 AM
I used something similar last year before deer season, got my notes and put a piece of tape in my scope cover with bullet drop out to 400 yards. Reminds me of my limits (I'm horrible at judging distances) when out hunting.

sohcgt2
July 30, 2009, 12:01 PM
Federals interactive chart allows the user to select weather conditions (wind, temp, elevation, etc).

taliv
July 30, 2009, 12:23 PM
KAC's iphone app uses your gps location, pulls the local weather and automatically uses it to calc your dope. also gets your angle to target

rcmodel
July 30, 2009, 01:27 PM
Who among us can judge distance in the field close enough to matter at 400 yards.

Unless you use a range-finder, the average person couldn't tell the difference between 350 and 450 yards by looking at a deer.

Because you can't tell if it's a 130 pound deer or a 260 pound deer at that range.

rc

Alagator
July 30, 2009, 04:11 PM
JimKirk-- thanks-- a sweet timesaver
RCModel-- Great point on the range thing-- I only use this on long hayfield shots-- I range the woodlines so I don't shoot at those emerging beyond my mpbr, and only then if there is very little wind. Trying to range a moving animal is like trying to do all those clicks. Every year before the season opens I practice my hunting shots from blinds and treestands, off shooting rails and shooting sticks, so I know what I can and can't do. Then subtract for cold, wet, tired and buck-fevered;)

JimKirk
July 30, 2009, 10:53 PM
Alagator
Wasn't trying to come off as a smart axe, I was doing the same thing until I took the time to read all the little lines above the inputs AND besides the check boxes! Seems the older I get, the more time I have to read directions, saves time too!

Jimmy K

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