"I believe the bases are aluminum, although I'm not sure. The polymer body completely covers the inside of the round as per the patent drawings."

Thanks man, that's a great catch with the patent drawing - and very promising that they can use aluminum. They should end up being pretty close to LSAT weight with the configuration. 

Now if they can just figure out polymer links to go with it...

Any idea of how this sort of cartridge would reduce muzzle flash?

gatnerd said...

 

Any idea of how this sort of cartridge would reduce muzzle flash?

 

Probably by being more thermodynamically efficient.

Pretty big news for TV and the advancement of polymer cases.

They have partnered with General Dynamics, a much larger defense contractor, and will be providing their cases for the .338 Machine Gun and NGSAR programs.

https://www.thefirearmblog.com/blog/2019/01/23/true-velocity-partners-with-general-dynamics-on-us-armys-next-generation-squad-automatic-rifle/

Looks like we're getting closer to a viable, lightweight case technology being fielded.

Found a nice video on Yotube of TV's presentation at SOFIC.

https://www.youtube.com/watch?v=pUS2_wLlvDY

The two most interesting slides:

That seems to correlate to a 31% weight savings, assuming the rest of the pallet is identical. If its indeed a 31% weight savings that puts it within spitting distance of LSAT's 34% weight reduction, although LSAT has the edge when polymer MG links are factored in.

This is interesting because its the first real indication they've managed to actually get this working down to 5.56. It also shows a serious reduction in chamber heat, potentially allowing for a lighter barrel'd LMG / Automatic Rifle thats still sufficiently resistant to cookoff.

The video also confirmed that General Dynamics is indeed using TV's cases with their .338 LWMMG. 

True Velocity is still plugging away.

Guns and Ammo has two good segments on them. The first covers a visit to the TV factory, and how tight the tolerances are on the cases (holding to 0.001" on the case wall; 0.0005" on the case mouth.) We also see confirmation that bullets are glued into the case mouth, which appears to be essential for these polymer cases vs brass/steel.

https://www.gunsandammo.com/show/guns-and-ammo-tv/videos/181995/325947

And an G&A article:

https://www.gunsandammo.com/editorial/true-velocitys-new-polymer-cased-ammunition/247607

The more interesting video is the on on TV's Facebook, showing a different clip. This shows, for the first time I'm aware of, polymer 5.56 cases being fired. The shooter also describes a dramatic decrease in chamber heat due to the polymer cases (firing 100rd's FA and then being able to put a finger in the chamber right after without burning.)

https://www.facebook.com/truevelocityammo/videos/469202490508619/

Freshly ejected cases are cool enough to be stuck in the shooters mouth:

The important question: will it be cheaper than Wolf?

True Velocity is going to be partnering with Sierra and releasing their cases for commercial sale:

https://www.wideopenspaces.com/sierra-bullets-true-velocity-unveil-competition-grade-composite-cased-ammunition/?fbclid=IwAR1aKh5LzNe_0Xe_P2F6vFrWxoIRmfZydIj6KMrescmgn2mVORQzMVdO6l0

This year at SHOT Show 2020, Sierra Bullets and True Velocity introduced the first-ever competition-grade line of composite-cased ammunition.

In fact, these cartridges are putting up numbers unsurpassed by brass-cased match-grade cartridges, as they're capable of sub-MOA accuracy at extended ranges and single-digit standard deviation in muzzle velocity.

The composite neck and body of the case also allow for excellent wall thickness uniformity, as well as precisely aligned features with minimal runout.

Thanks to the composite, engineers can control the internal geometry of the case, meaning they can tweak the powder chamber to get optimal internal ballistics.

With better burn efficiency, the ammo requires 10 percent less propellant, which results in less barrel wear over time and less recoil with each shot.

I need their 5.56 ammo so I can pull the bullets and load M855A1 EPRs to put in my Kel-Tec RDB so I can fight robots while my built-in cybernetic mirrored shades are deployed.

Now on commercial sale in .308 Win (to start with): https://www.thefirearmblog.com/blog/2020/01/29/shot-2020-true-velocity-and-sierra-bullets/

Some more pictures of TV .308 Win here: https://forum.cartridgecollectors.org/t/308-win-from-sierra-true-velocity-composite-cartridge-case-new-for-2020/37308

A thought crossed my mind: as I understand it, one problem with polymer versions of metal cases is that the necks have to be very thin, hence TV preferring a neckless design for their clean-sheet 6.8 mm NGSW. A alternative approach might be to design a bullet with a reduced diameter at the case mouth, so the neck can be thicker. Not sure if this would allow enough contact with the bore to keep the bullet stable, though.