"I dunno.  They've been working on polymer hybrid cases for over half a century.

Below:  Left, 7.62 NATO from 1959.  Right, .221 IMP from 1973.  Look familiar?   ;^)"

 Yeah, it's still uncertain to be sure. Though the construction of these Velocity cases does look a bit different, with the metal being internal and the polymer overmolding part of the base - possibly reducing the risk of case head separation?

Still, my $0.25 bet (most I'm willing to bet on anything other the Roulette) is on the Shell Shock hybrid AL/Steel cases being the most successful near-term solution. 

https://www.google.com/patents/US9587919

http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1=20160091288.PGNR.

However, there are no images as far as my google-fu is about

BTW, what a nice collection of patents, Emeric. I'm impressed

gatnerd said...

Could you share some more info about the Neckless Cartridges?

See page 114+ of this article.

Tell me if I have understood it correctly: in order to maintain compatibility, part of the body of the bullet would act as a neck in the chamber?

If it is the case, then there would be a small gap in the chamber, corresponding to the thickness and volume of cartridge neck, right?

Best for Emeric to answer questions on this!

poliorcetes said...

Tell me if I have understood it correctly: in order to maintain compatibility, part of the body of the bullet would act as a neck in the chamber?

If it is the case, then there would be a small gap in the chamber, corresponding to the thickness and volume of cartridge neck, right?

Right.

The bullet is potentially unsupported during a much longer "freebore", so there is a need to mitigate unwanted consequences, but it's not significantly different from a CT round.

gatnerd said...

Could you share some more info about the Neckless Cartridges? I recall reading about them here - but completely forgot everything but the name "neckless." 

The basically the neck of the case is eliminated and the projectile is welded directly into the case body. The result is that the shoulder of the case becomes thicker to support the projectile and the power capacity is somewhat reduced - it is further reduced by the projection of more of the projectile into the case. Now the entire distance from the shoulder to the OAL is available for ogive, with the downside that the lead to the rifling become very long. The 7.62x51 goes from being a battle rifle round to a lighter intermediate round that can handle the longest ogive projectiles. The same is possible in 5.56x45 but the result will be rather low powered.

Just to update this, it looks like True Velocity has a working website now, and claims to have rounds from 5.56 to 14.5mm:

http://truevelocityinc.com/

We currently manufacture 5.56 NATO, 7.62 NATO, .338 NORMA, .50 BMG, and 12.7 x 108 ammunition in our proprietary polymer case design.

Interesting claims are:

-Over 50% case weight reduction (totally believable)

-Weapons remain cooler (something that was hinted at with LSAT)

-Provides substantial flash reduction (this I have no idea about, but would be awesome if true.)

It appears the polymer body is overmolded around the internal metal base. The metal looks to be steel; without some type of shielding aluminum might have the risk of burn through.

I wonder if ZAMAK zinc alloy would work as a base for this type of cartridge? It's lighter/cheaper than steel and can be easily die cast. 

gatnerd said...

 

Just to update this, it looks like True Velocity has a working website now, and claims to have rounds from 5.56 to 14.5mm:

http://truevelocityinc.com/

We currently manufacture 5.56 NATO, 7.62 NATO, .338 NORMA, .50 BMG, and 12.7 x 108 ammunition in our proprietary polymer case design.

Interesting claims are:

-Over 50% case weight reduction (totally believable)

-Weapons remain cooler (something that was hinted at with LSAT)

-Provides substantial flash reduction (this I have no idea about, but would be awesome if true.)

It appears the polymer body is overmolded around the internal metal base. The metal looks to be steel; without some type of shielding aluminum might have the risk of burn through.

I wonder if ZAMAK zinc alloy would work as a base for this type of cartridge? It's lighter/cheaper than steel and can be easily die cast. 

 

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.

I ran this design by Kori Phillips, and she agreed that it was promising - more promising than any of the other polymer composite configurations. I have also heard, although I cannot disclose any details about, endurance testing that was conducted with full auto weapons by a third party, and reportedly the ammunition performed extremely well.

"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?