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Federal T762TNB1 ammo review and the road to a clone. Pic heavy

This is a discussion on Federal T762TNB1 ammo review and the road to a clone. Pic heavy within the Ammunition forums, part of the M14 M1A Forum category; Last month I purchased three boxes of Federal T762TNB1. For those unfamiliar with this ammo please google MK319 MOD 0 and link to dtic.mil web ...


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Old March 16th, 2012, 06:07 PM   #1
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Federal T762TNB1 ammo review and the road to a clone. Pic heavy

Last month I purchased three boxes of Federal T762TNB1. For those unfamiliar with this ammo please google MK319 MOD 0 and link to dtic.mil web page. *I have to edit this they will not let me link from this web sight.

These are the civilian version of the MK319 MOD 0. These cartridges are optimized for a 16" barrel, so I wanted to try them in my Socom 16.
Here is how they come.





The bullets are a 130gr OTM. The cartridges have a length of 2.800" + or - .003". Total weight of the cartridges fell into three groups 358gr + or - .2gr. 357.4gr + or - .2gr. and 356.4gr + or - .2gr.

Here is what the components look like.


130gr OTM bullet


Spherical powder


"FC 10" is the T762TNB1. "FC 09" is a XM762D case.

I pulled six bullets for the Team. here's the accounting of the components.
The bullet weights are 130gr + or - .2gr. Lengths from 1.015" to 1.008". Bullet ogive to bullet base .452" + or - .002"

Powder is a Spherical type.
The charges varied
1; 45.2gr
2; 44.5gr
3; 43.2gr
4; 44.9gr
5; 44.5gr
6; 44.6gr.

Cases are of military weight. No NATO markings on cases.
Weights are 181.8gr +or - .4gr with primer.

I was able to chrono two groups of six yesterday.
Here's the data.
Group A,
Lo; 2840fps
Hi; 2890fps
Avg; 2861fps
ES; 50.18fps
SD; 16.21fps
1; 2861fps
2; 2858fps
3; 2861fps
4; 2856fps
5; 2890fps
6; 2840fps
Group B,
Lo; 2840fps
Hi; 2887fps
Avg; 2860fps
ES; 46.76fps
SD; 18.22fps
1; 2846fps
2; 2887fps
3; 2856fps
4; 2852fps
5; 2876fps
6; 2840fps

As you can see, average velocity was about 2860fps.
here is how they grouped at 50yds.


Four of the six are grouped together, and me being sloppy. There is a seventh hole that was under a cover dot that got knocked off.
This is from group A. Group B was shot with another load I wanted to chrono so no picture, sorry.

The final pic is how the primers look.


Primers are flat but no over pressure signs.

Stay tuned for part two, The road to a clone.
Thanks
Glenn

Thanks from Swamp Rat, Butzbach, m14nm and 3 others

Last edited by geepee3; March 17th, 2012 at 07:46 AM.
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Old March 16th, 2012, 07:11 PM   #2
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I worked up a load over the summer that chrony'd 2970 avg out of my 20in AR with Varget. Where'd you get the boxes?

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Old March 16th, 2012, 07:12 PM   #3
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The road to a clone.

Part two is going to be a work in progress, so please bear with me.
At this time I have 400 pulled 130gr OTM MK319 MOD 0 bullets.
They where purchased from EvergladesAmmo.com two weeks ago. And of course they are out of them already. People who load 300 AAC Blackout like these bullets too.
Let me tell you if you purchase these pulled bullets you will have some work ahead of you. It took me 2.5hrs to clean the bullet sealant out of the bottom channel(and some out of the top one) and remove the media from inside the open tip(that's the time consuming part!) from 100 bullets. I have done 200 so far, 200 to go.

So my plan is to use IMR 3031 powder, LC or GGG once fired brass, CCI BR2 primers.

I do plan to deviate from the 2.800" length and shorten the cartridge. Fellow member Bamban had pulled some Malaysian 7.62 ammo and replaced the M80 ball with the MK319 bullet. He set them lower than the Federal T762TNB1 bullets. I plan to do the same thing, which is to set the bullet close to the top of the center band.


Bullet seating comparison, M80 bullet, MK319, Hornady 155gr A-MAX, 150gr bullet pulled from XM762D cartridge.

With my test case I was able to get the OAL and ogive I needed.



And with the Federal cartridge.


(L)Federal, (R)Clone

This gives me an ogive of 2.180" and an OAL of about 2.742"
Because the ogive on these bullets are more consistent than OAL. I recommend using a bullet comparator for seating these bullets. I use the Hornady bullet comparator.

Now I just need to work up a load to get me in the mid 2800fps.
As things progress I will be updating this thread. I hope to go out on Sunday to test some loads.
So please excuse me, I have some loading to do.

Thanks,
Glenn

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Old March 16th, 2012, 07:27 PM   #4
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Quote:
Originally Posted by Swamp Rat View Post
I worked up a load over the summer that chrony'd 2970 avg out of my 20in AR with Varget. Where'd you get the boxes?
Alfaweapons, heres the link.

alfaweapons.com/federal-t762tnb1-762x51-130gr-nb-otm-reclassified-20-500-t556tnb-p-29830.html

$21.01 a box of 20. They have them reclassified as t556tnb. But I did get the 7.62x51 cartridges.
Out of a 16" barreled Scar 17 the MK319 mod 0 is supposed to have a velocity of 2925fps.

Glenn

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Old March 16th, 2012, 08:25 PM   #5
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Hey Glenn,

Can you measure the length of the bullet and send it to me?

QuickLOAD says that, using a 130gr Barnes TTSX bullet, 44.7gr of IMR 3031 would put it right at 2860 fps. So maybe you can start around 44 grains or so. Here are a few loads that might help you figure out a what kind of powders you could choose from.



The length of the actual bullet might change these numbers so once I get it from you I'll rerun the what-if scenario. Oh and don't forget, my software will be off about 25 fps or so either way so you would want to work up to the loads like normal.

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Old March 16th, 2012, 08:31 PM   #6
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After posting my last, I think Win 748 looks like the better of the powders to try. The volume used is better (the powder is not compressed as much) and the pressure is almost the lowest listed.

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Old March 16th, 2012, 09:07 PM   #7
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Quote:
Originally Posted by RAMMAC View Post
Hey Glenn,

Can you measure the length of the bullet and send it to me?

The length of the actual bullet might change these numbers so once I get it from you I'll rerun the what-if scenario. Oh and don't forget, my software will be off about 25 fps or so either way so you would want to work up to the loads like normal.
Pulled Bullet lengths run from 1.015" to 1.006, a little more variance in length. Ogive to bullet base(not cartridge) is the same .452" + or minus .002".
Seating depth will be at .280"

I would like to know what powder they used. Most of the pulled powder was around 44.6gr. You have anything on Ramshot Tac? I have that.

Thanks,
Glenn

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Old March 16th, 2012, 11:27 PM   #8
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I goofed up Glenn, I used 2.80" as the overall length. I'll rerun the numbers and include the Ramshot Tac powder. Let me make sure I've got it right, your using a 2.742" correct? I'll do two charts, one using LC cases and the other with GGG cases.

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Old March 17th, 2012, 12:44 AM   #9
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OK Glenn, I sorted them by chamber pressure, low to high. Cartridge overall length 2.742".

P.S. I forgot to warn you and anybody else looking at these numbers, any of the ball powders listed shouldn't be compressed. So I don't recommend using any ball powder charge weight that corresponds to a case volume used of over 100%. These numbers are to be used for reference only.




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Last edited by RAMMAC; March 17th, 2012 at 12:55 AM.
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Old March 17th, 2012, 01:07 AM   #10
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I like the looks of;
  • Win 748
  • H322
  • BL-C2
  • Ramshot TAC

I think that if you start about a grain lower than the listed charge weights with one of these powders you should find a pretty good load. I'm thinking that H322 looks like a nice compromise between pressure and speed, maybe a starting charge of 44 grains and then working up from there.

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Old March 17th, 2012, 04:03 AM   #11
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Deleted. Redundant


Last edited by Bamban; March 17th, 2012 at 04:22 AM.
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Old March 17th, 2012, 04:03 AM   #12
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RAMMAC,

What version is your QL with XBR 8208?

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Old March 17th, 2012, 05:58 AM   #13
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RAMMAC,
Thanks for running the numbers for me.
H322 does look the best. And is close to the actual weight of the powder pulled from the original cartridge.
I may end up trying to find a lighter load that shoots well, slower velocity, less pressure. Like the SGK 150gr FMJBT I am using.
Thanks again for your input. It's always a great help.

Glenn

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Old March 17th, 2012, 06:04 AM   #14
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Quote:
Originally Posted by Bamban View Post
RAMMAC,

What version is your QL with XBR 8208?
Bamban,
Did you ever get a chance to chrono the 130gr OTM's bullets you loaded in the Malaysian ammo?

Glenn

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Old March 17th, 2012, 06:24 AM   #15
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Not to poop on anyone's parade, but... what is the purpose of these cartridges? Just better efficiency out of the 16" tube?

The link in GP's OP is dead.

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