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308 150gr FMJ FLAT BASE bullets.

This is a discussion on 308 150gr FMJ FLAT BASE bullets. within the RAMMAC forums, part of the Gun Professionals category; Hello RAMMAC. I have recently Acquired some 308 150 gr Full metal Jacket Flat base bullets (I tumbled them to get some tarnish off of ...


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Old June 2nd, 2013, 05:27 PM   #1
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308 150gr FMJ FLAT BASE bullets.

Hello RAMMAC. I have recently Acquired some 308 150 gr Full metal Jacket Flat base bullets (I tumbled them to get some tarnish off of them). Now I was told these are older WW2 era projectiles. I was planning on reloading some of these for my Standard M1A. Do you have any experience or know anything about this type of bullet?
Thanks for any info.

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Old June 3rd, 2013, 12:03 AM   #2
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Quote:
Originally Posted by TheShooter View Post
Hello RAMMAC. I have recently Acquired some 308 150 gr Full metal Jacket Flat base bullets (I tumbled them to get some tarnish off of them). Now I was told these are older WW2 era projectiles. I was planning on reloading some of these for my Standard M1A. Do you have any experience or know anything about this type of bullet?
Thanks for any info.
If these are WWII bullets then they had to have come from M1 Garand M2 cartridges.

I've never worked with those bullets but Berger has a 150 grain target bullet that is very similar and my QuickLOAD software has the Berger bullet in it's database, so I can work up estimates for the bullet if you want or I can give you info from Berger's reloading manual. Hornady's reloading manual has a service rifle section for the M1A rifle and they have load data for their 155 gr Amax in the M1A. Hornady also has a listing for the standard bolt action rifle using their 150 gr Interlock bullet which is similar to the military 150 grain bullet.

In general, the Garand's M2 cartridge was designed to produce just under 2800 fps at the muzzle. Most of the references indicate that about 44 grains of IMR 4895 would produce similar muzzle velocities in the 22" barreled M1A. I would recommend not going much higher than that powder charge weight, it's right in the range of pressures and velocities that I feel comfortable with but I wouldn't want to go much higher.

As for accuracy, I can't say much other than to tell you that if you pushed the bullet to the same kind of velocity as the Garand pushed it, then you should get similar accuracy as the Garand had with it.

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Old June 3rd, 2013, 06:35 AM   #3
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The base is probably 'exposed lead'.
For best accuracy, eye-ball and sort the bases for uniformity and lack of defects.

The non-perfect ones are fine for general use, but might be slightly less accurate.

Jay Kosta
Endwell NY USA

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Old June 3rd, 2013, 02:40 PM   #4
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I've always read the flat based M1 bullets are more accurate than the boat tailed 7.62 bullets. Supposedly (that's right, internet rumor not confirmed by me) is that the boat tailed bullets meant for the M14 were also meant for the M60 and with machine guns you want a "cone of fire" vs. a group, so the bullets didn't need t be as well made/accurate.

I did read it on the internet.

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Old June 3rd, 2013, 03:15 PM   #5
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For what it is worth from USMC Machine Guns and Machine Gunnery and 6-5 Rifle Squad- When a burst is fired, the vibrations of the gun and tripod, variations in ammo, and conditions of the atmosphere give each bullet a trajectory differing slightly from that of others. The resulting group of trajectories is known as the cone of fire. For the M240B, at ranges up to 700 meters over level or uniformly sloping ground, the lower bound of the cone of fire does not rise above the height of a standing man(1.8 meters)"grazing fire" With each increase in elevation of the gun, there is further rise of the cone above ground

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Old June 4th, 2013, 07:33 PM   #6
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Do you think I would be safe to load these at 2.780 COAL?

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Old June 4th, 2013, 09:47 PM   #7
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Berger's recommended COAL is 2.81" and the military used 2.80", changing the length by a couple of thousandths of an inch shouldn't cause any damage but it will effect pressure, velocity, and accuracy to some degree. How much change there will be, I can't say, you will have to experiment and watch for pressure issues. My internal ballistics software estimates that your shorter COAL (from 2.80" to 2.78") will increase the pressure by only 1000 or so psi while the velocity will only change by less than 50 fps.

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Old June 9th, 2013, 01:18 PM   #8
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There are two specifications for military ammo. Link Pack for machineguns is not required to have as small of a group as Clip Pack, I can quote the actual figures if any body is interested. As your bullets are pulls, there is no way of knowing whether each bullet is Link or Clip, but there will be no danger to shooting them.

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