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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; Originally Posted by charlie98 Not to poop on anyone's parade, but... what is the purpose of these cartridges? Just better efficiency out of the 16" ...


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Old March 17th, 2012, 07:15 AM   #16
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Originally Posted by charlie98 View Post
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.
They must have cut me off. The link was working fine yesterday.
I will see if I can find another.

As to you question. The round is designed for a 16" barrel on the Scar 17, it also works on their shorter barrel(13") . the bullet is barrier blind. Less recoil and low flash.

Glenn

P.S. I'm a Plumber, it's OK to poop on this parade.

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Old March 17th, 2012, 07:40 AM   #17
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They must have cut me off. The link was working fine yesterday.
I will see if I can find another.

As to you question. The round is designed for a 16" barrel on the Scar 17, it also works on their shorter barrel(13") . the bullet is barrier blind. Less recoil and low flash.

Glenn

P.S. I'm a Plumber, it's OK to poop on this parade.
That's the second time I've seen that comment. I have some 5.56mm rounds that are the equivalent to the 7.62mm rounds but I have not been able to find a satisfactory explanation to the 'barrier blind' function. I can attest to the low recoil benefit... my 110grn TAP's are almost fun to shoot!

I never did get a answer to this.

I'm a pool guy... it is NOT OK to poop in the pool!

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Old March 17th, 2012, 08:07 AM   #18
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Barrier blind means the bullet will stay on track when going through doors or windows, In other words minimum deflection through light barriers.

try this link, www.marinecorpstimes.com/news/2010/02/marine_SOST_ammo_021510w/

Glenn

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Old March 17th, 2012, 08:12 AM   #19
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This looks like an interesting round. Didn't the Japanese develop a 130 grain load for reduced recoil? Had a purple tip, IIRC.

I'm going to have to get some, so I am following this with much interest. The reason I bought my Scout is I have been squeaking about a short barreled 7.62 with a lighter load being what a battle rifle should be. I finally stepped up and put my money where my mouth is.

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Old March 17th, 2012, 09:04 AM   #20
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RAMMAC,

What version is your QL with XBR 8208?
3.6 with DLL 1.00

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Old March 17th, 2012, 09:17 AM   #21
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This looks like an interesting round. Didn't the Japanese develop a 130 grain load for reduced recoil? Had a purple tip, IIRC.

Conceptually, it's similar to 7,35 Carcano.. But the higher operating pressures make for better muzzle velocity. Better launching platform as well...

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Old March 17th, 2012, 09:19 AM   #22
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Originally Posted by charlie98 View Post
That's the second time I've seen that comment. I have some 5.56mm rounds that are the equivalent to the 7.62mm rounds but I have not been able to find a satisfactory explanation to the 'barrier blind' function. I can attest to the low recoil benefit... my 110grn TAP's are almost fun to shoot!

I never did get a answer to this.

I'm a pool guy... it is NOT OK to poop in the pool!
This is one of the slides from the documentation that Glenn referenced, it mentions the rear penetrating concept.


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Old March 17th, 2012, 11:56 AM   #23
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Conceptually, it's similar to 7,35 Carcano.. But the higher operating pressures make for better muzzle velocity. Better launching platform as well...
For some reason, I'm thinking they developed it (7.62 NATO) for the FAL.

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Old March 17th, 2012, 01:19 PM   #24
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For some reason, I'm thinking they developed it (7.62 NATO) for the FAL.
???

Oh, too OT to even start...

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Old March 17th, 2012, 03:02 PM   #25
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???

Oh, too OT to even start...
Maybe. I recall someone's military loading a lighter bullet in 7.62 before all this.

Apparently the purple tip was a dim trace US round.

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Old March 17th, 2012, 07:51 PM   #26
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OK, Back at the ranch.......

I have two groups of bullets to test tomorrow.





I am taking my own advise and starting low and working my way up.
First group will be with LC brass, IMR 3031 powder and CCI BR2 primers. Three sets of six. 42.0gr to 43.0gr in .5gr increments.
Second group will be with GGG brass, Ramshot Tac and CCI #34 primers. Four groups of six. 43.0gr to 44.5gr in .5gr increments.

I did run into a problem using my Hornady bullet comparator. Being pulled bullets the ogives where not the same on about a third them. I set the bullets by using the bottom shelf of the top cannelure and the base of the case to give me a measurement of 2.020". That seated the bullets to my liking.

I will post my results some time tomorrow evening.
Thanks you.

Glenn

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Old March 17th, 2012, 10:54 PM   #27
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I must say I'm intrigued...

I guess I'll have to pull one of my 5.56mm bullets and see what I have. It just doesn't make sense to me that a OTM bullet would have 'penetrator' abilities... or I guess properly phrased... 'defeat' capabilities.

GP, I'm curious as to what you find... especially with the IMR3031 vs TAC.

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Old March 18th, 2012, 08:40 AM   #28
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I must say I'm intrigued...

I guess I'll have to pull one of my 5.56mm bullets and see what I have. It just doesn't make sense to me that a OTM bullet would have 'penetrator' abilities... or I guess properly phrased... 'defeat' capabilities.

GP, I'm curious as to what you find... especially with the IMR3031 vs TAC.
It was labeled match rear penetrating?

There was probably some confusion there. A match bullet unless specifically designed for it is not always going to be barrier blind.

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Old March 18th, 2012, 12:20 PM   #29
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It was labeled match rear penetrating?

There was probably some confusion there. A match bullet unless specifically designed for it is not always going to be barrier blind.
Sorry, GP, not trying to hijack your thread...





Obviously a very similarly designed bullet to GP's 130grn .30cal bullet. It has an open tip, but the cavity is not maybe 1mm deep.

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Old March 18th, 2012, 12:58 PM   #30
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It was labeled match rear penetrating?

There was probably some confusion there. A match bullet unless specifically designed for it is not always going to be barrier blind.
Maybe they misidentified it but yes, they call it an OTMRP bullet.

Another slide from Glenn's reference info.


Both bullets, the 5.56 and 7.62, were made using a reverse draw method which leaves the typical open tip. The area inside is part brass and part lead. The open area in the pictures below is actually filled with lead in the production bullets. The major difference between the two bullets is that the 5.56 is a boat tail design and the 7.62 is a flat base.

From Cheaper Than Dirt's Shooter's Log
http://cheaperthandirt.com/blog/?tag=mk-318-mod-0
Quote:
The bullet was named the Open Tip Match Rear Penetrator. The front of it is a hollow point backed up by a lead core, but the lead core only goes about halfway down the length of the bullet; the rear half is solid brass. When the OTMRP bullet hits a hard barrier, such as the windscreen of a car being driven by a suicide bomber, the front half of the bullet smooshes (that’s a technical term) against the barrier, breaking it so the “penetrator” half of the bullet can fly through and hit the target beyond. This “barrier blind” bullet acts like two bullets in one, the second brass bullet flying exactly through the hole made by the first lead bullet.
The MK 318 Mod 0 5.56 bullet.


The MK 319 Mod 0 7.62 bullet.

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