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....
...

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.

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).

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!

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..)

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:

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..)

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.

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.