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M80 Ball and M59 Ball 7.62mm Trajectory Data

This is a discussion on M80 Ball and M59 Ball 7.62mm Trajectory Data within the Ammunition forums, part of the M14 M1A Forum category; Can you someone post the Trajectory Data of M80 Ball and M59 Ball 7.62mm in a standard M14 or M14A1? or a free download perhaps.... ...


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Old August 19th, 2009, 07:52 PM   #1
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M80 Ball and M59 Ball 7.62mm Trajectory Data

Can you someone post the Trajectory Data of M80 Ball and M59 Ball 7.62mm in a standard M14 or M14A1?

or a free download perhaps....

"AERODYNAMIC CHARACTERISTICS OF THE 7.62 MM NATO AMMUNITION M-59, M-80, M-61, M-62"
by the ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

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Old August 23rd, 2009, 11:43 AM   #2
 
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Ballistics Software

On mytargets.com they have a great free program called Win Ballistics. It will give velocity, energy, dop and drift. Look for it under the downloads link.

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Old August 23rd, 2009, 04:09 PM   #3
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Hornady Ballistics Calculator

Quote:
Originally Posted by Long Shot View Post
On mytargets.com they have a great free program called Win Ballistics. It will give velocity, energy, dop and drift. Look for it under the downloads link.
I couldn't get the Win Ballistics .exe to open and download (not even zipped).

But here's a good site to bookmark:

http://www.hornady.com/ballistics/ba...calculator.php

If you know the Ballistic Coefficient (BC) and muzzle velocity in feet per second (fps), this site will allow you play around with various zero ranges for any ammunition to determine the bullet drop at other ranges out to 1000yds.

Thanks Hornady!

(Hey... I'm not eatin' cheese here. I don't have any relationship with them except to shoot their ammunition, but it's nice to see a supportive manufacturer!)

Federal has a program that you can load which is basically a catalog that gives the load data for their products, but unfortunately doesn't allow for experimentation with zero ranges, etc. (It does provide the BC and muzzle velocities, though, so you can combine that data with the Hornady calculator to come up with your own zeros.)

I don't know where to find the BC and velocity data for the M80 ball and other military loads, but I bet somebody else here on TFL does!

HTH,
Mike

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Old August 24th, 2009, 12:52 AM   #4
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Here is the download.

http://www.dtic.mil/cgi-bin/GetTRDoc...c=GetTRDoc.pdf

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Old August 24th, 2009, 03:44 AM   #5
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Here are some trajectory charts. The one marked (S) is "Standard" and the 147 grain bullet should be about right for M80.

http://www.shootingtimes.com/ballist...inchester.html

http://www.gunsandammomag.com/cs/Sat...7.62+NATO%2529

https://www.rrarms.com/catalog.php?prod=AUSA3081

http://www.winchester.com/products/c...oZXN0ZXI=&bn=4

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Old May 9th, 2012, 08:34 PM   #6
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Though 5+ years late, this may be helpful to anyone running across this thread:
(Like me, for instance.)

http://www.gunshopfinder.com/springf...allistics.html

I was hoping to find some parabolic graphics. Anyone?

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Old May 9th, 2012, 09:28 PM   #7
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Here are the ballistics data for a number of bullets, all using Aberdeen Proving Ground (APG) results, with "G7" ballistic coefficients (NOT "G1" as in commercial tables..)

Diameter ___Weight___ Type___ G7BC

0.224___ 55___ M193___ 0.120
0.224___ 62___ M855___ 0.151
0.224___ 62___ SS109___ 0.158
0.308___ 149___ M80___ 0.200
0.308___ 168___ M852___ 0.215
0.308___ 173___ M118___ 0.240

0.308___ 190___ Sierra MK___ 0.252
0.31___ 123___ 7.62m43___ 0.156
0.51___ 650___ M33___ 0.340

0.277___ 115___ Sierra MK___ 0.160
0.277___ 110___ Hornady BTHP___ 0.180
0.277___ 110___ Hornady Vmax___ 0.185
0.277___ 85___ Barnes TSX___ 0.123
0.224___ 77___ Sierra MK___ 0.19
0.224___ 75___ Hornady Amax___ 0.212
0.224___ 68___ Hornady OTM___ 0.164
0.224___ 75___ Hornady OTM___ 0.195


Since the M2 ball (M1 Garand) is flat based, it follows a "G8" ballistic coefficient:

0.308___ 152___ M2 (G8)___ 0.210


You need to consider height of soght line above the bore, altitude, etc. As shown in the excellent PDF linked above, the drag tables are specific for the types of bullet, in this case a boat tail (for G7 data) with specific ratios of cylindrical length, ogive, etc.

As pointed out in the PDF, the trajectories of M80 and M59 are basically identical...

Take a peek at an example in Posts 30 and 45 here:

http://www.falfiles.com/forums/showt...ght=ballistics

HTH,

JWB

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Old May 9th, 2012, 09:52 PM   #8
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sry can't find m59

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Old May 10th, 2012, 08:35 AM   #9
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Quote:
Originally Posted by jbrooks View Post
Here are the ballistics data for a number of bullets, all using Aberdeen Proving Ground (APG) results, with "G7" ballistic coefficients (NOT "G1" as in commercial tables..)

Diameter ___Weight___ Type___ G7BC

0.308___ 149___ M80___ 0.200
0.308___ 168___ M852___ 0.215
0.308___ 173___ M118___ 0.240

0.308___ 190___ Sierra MK___ 0.252

Since the M2 ball (M1 Garand) is flat based, it follows a "G8" ballistic coefficient:

0.308___ 152___ M2 (G8)___ 0.210

http://www.falfiles.com/forums/showt...ght=ballistics

HTH,

JWB
I find it interesting that the flat based 30-06 M2 Ball bullet has a higher BC than the boat tailed M80 7.62x51 bullet.

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Old May 10th, 2012, 10:01 AM   #10
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Quote:
Originally Posted by Sailormilan2 View Post
I find it interesting that the flat based 30-06 M2 Ball bullet has a higher BC than the boat tailed M80 7.62x51 bullet.
They are 2 different ballistic coefficients.

The G7 is for boat tail, the G8 is for flat base. There are 2 different drag profiles.

This figure shows the difference in drag coefficients. (Compare this, for example, to Figure A.1 of the PDF referenced abovs...) The "G1" BC is the one commonly used in all commercial ballistics tables (Hornady, Speer, etc) but it is not representative of the actual aerodynamic shape of modern bullets.

The data I have shown is from the BRL (Ballistics Research Lab) and is correct for the different types of BC.

Some, but not all, ballistics programs allow yu to select the correct BC type.

My own ballistics programs are based on the BRL sources.

Noe that drag is not a function of speed, but rather a function of speed relative to the speed of sound (Mach number) which varies with temperature, humidity, etc. Most tables are calculated at sea level and 70 degrees F. Any deviations from those parameters will affect the tables.

HTH,

JWB
Attached Images
File Type: jpg B_C_Curves.jpg (24.2 KB, 16 views)

Thanks from LausDeo
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Old May 10th, 2012, 02:31 PM   #11
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Quote:
Originally Posted by Sailormilan2 View Post
I find it interesting that the flat based 30-06 M2 Ball bullet has a higher BC than the boat tailed M80 7.62x51 bullet.
Sailormilan2...

You have to know the parameters used to establish the Coefficient. I'm reasonably sure that weight and diameter, in addition to geometery, is used. The .30-06 is usually a higher weight (grains) than the 7.62/.308 and likely accounts for most of the increase in BC.

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