High Chamber Pressure?

#1
Am I missing something here?

Army's new machine gun will blast like battle tanks
The goal is for the weapon’s chamber pressure to achieve similar levels to battle tanks...........
The Army’s new weapon will look like a light machine gun, but will put M1 Abrams Main Battle Tank-style blasting power literally at the fingertips of U.S. soldiers...........
The goal is for the weapon’s chamber pressure to achieve similar levels to battle tanks.“But the challenge with 7.62mm ammo is that it has too much mass and not enough propellant. The right solution is somewhere between the two, where you have enough mass to penetrate but you’re still moving fast enough.”
The Army Says Its New Assault Rifle Will Pack a Punch Like a Tank's Main Gun
The Army claims its new assault rifle will unleash a hailstorm of specially-designed shells with as much chamber pressure as a battle tank to tear through even the most advanced body armor............
And more importantly, the platform will incorporate a chamber pressure superior to the current system in soldiers’ arsenals to ensure that the rounds can still blast through enhanced enemy body armor at up to 600 meters..............
The goal, as Norman put it, is to equip infantry soldiers with an automatic rifle “that fires a small bullet at the pressure equivalent to what a tank would fire.”.............
“The chamber pressure for the standard assault rifle is around 45 KSI [kilopound per square inch], but we’re looking for between 60 and 80 KSI … the chamber pressure when an M1 Abrams tank fires is on that order,” Gordon told Task & Purpose. “We’re looking to reach out around 600 meters and have lethal effects even if the target is protected by body armor.”..........
“The challenge of the 5.56mm is that it doesn’t have enough mass [to defeat enemy body armor],” Norman said, referring to Chief of Staff Gen. Mark A. Milley’s April 2017 testimony before lawmakers on the Army’s growing ammo problem downrange.
 
#4
Try something like this...
Oh, I see.
Posted October 9, 2017
A 6.5mm CT Carbine prototype.

And does that have a "Chamber pressure like a tank gun"?

But while the Army had previously focused on fielding an improved carbine with a range and accuracy superior to the standard M4 that would also chamber a round between 6.5mm and 6.8mm, the service recently changed gears to prioritize the muscular automatic NGSAR.
 
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#5
How about: contract awarded to Textron and five other makers to build prototype weapons for the Next Generation Squad Automatic Rifle program.

One of those will use an intermediate calibre high pressure round with a telescoped case that will go bang much loudly and spew forth a high ballistic coefficient medium weight projectile with a penetrator core super quick fast like innit.
 
#6
One of those will use an intermediate calibre high pressure round with a telescoped case that will go bang much loudly and spew forth a high ballistic coefficient medium weight projectile with a penetrator core super quick fast like innit.
That's the ticket.

Or what of;

Capture.PNG


No chamber pressure, caseless ammunition and the bullet accelerating after leaving the barrel.
 
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#7
Or...

Use the Federal 5.56 Valkyrie round.

Which uses a necked down intermediate case to shove more powder behind a 90 grain high BC boolit, which still steams along at 1400fps 1000 yards out.

Federal didn't spend a shitload developing that for the civilian market.
 

DaManBugs

LE
Book Reviewer
#8
#9
Use the Federal 5.56 Valkyrie round.
You will have to fill it to the top.
It's only 55 KSI, they are looking for 60 to 80 KSI.
"Chamber pressure like a tank gun"
 
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ugly

LE
Moderator
#11
Am I missing something here?
Physics, in a word, however high chamber pressure is no good it burns out barrels and ruins cases. It means the barrel and mechanism weighs so much you have to have a vehicle to move it!
 
#14
Recoil will be interesting at those pressures.
As @ugly says, burns out barrels.
Rifles are a compromise between pressure, recoil, barrel wear etc.
Higher pressure generally means a thicker barrel and everything else will need to be proportionately stronger to cope.

The goal of every rifle manufacturer and designer has been more penetrating power and more accuracy. But this is balanced against how much ammo the average soldier can carry, which is one reason we went from 7.62 to 5.65.

Now we have more body armour and engagements at longer range and there have been mutterings that the standard NATO 5.65 round does not have sufficient penetration to defeat modern body armour and is not very effective above about 400m.

Ye cannae change the laws o' physics Jim!

As it's Fox News, thread should probably be moved to the NAAFI
 

ugly

LE
Moderator
#15

DaManBugs

LE
Book Reviewer
#16

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