Over 42,000 pounds of energy ???

[Muleskinner]

Wow...

 

[Bullfrog]

First shot tested in 2012... I guess the news didn't get around very fast.

 

[Bullfrog]

2016

 

[Park ranger]

What twist rate does that thing need?

 

[jcutonilli]

262 million ft-lbs muzzle energy

18.9 million grain projectile
2500 ft/s

16-inch/50-caliber Mark 7 gun - Wikipedia

en.wikipedia.org

 

[smdub]

^ battleship is not shoulder fired / man portable. The rail cannons were even larger than battleships.

Its a "thing" to neck down 20mm Vulcan cases to smaller diam to do similar things. I don't follow it enough to know what speeds they are achieving but its a boatload of energy. The most common seems to be using long 50cal diam projectiles. I'm guessing that its the most common since barrel blanks are readily available and its not a DD. I suspect barrel life is great if they can get to 100 shots.

 

[jcutonilli]

^ battleship is not shoulder fired / man portable. The rail cannons were even larger than battleships.

Its a "thing" to neck down 20mm Vulcan cases to smaller diam to do similar things. I don't follow it enough to know what speeds they are achieving but its a boatload of energy. The most common seems to be using long 50cal diam projectiles. I'm guessing that its the most common since barrel blanks are readily available and its not a DD. I suspect barrel life is great if they can get to 100 shots.

The 14.9 designations indicates that it is ~0.58 in which would make it a DD. It apparently has a bullet weight of 1690 gr. With a muzzle energy of 42,000, the bullet velocity would be ~3350 ft/s.

Not sure I see the benefit over a 20 mm. 20 mm have been made "man portable".

Anzio 20mm rifle - Wikipedia

en.wikipedia.org

Lahti L-39 - Wikipedia

en.wikipedia.org

I would not describe any of these as shoulder fire or man portable (including the 14.9 SOP) however.

 

[smdub]

Not sure I see the benefit over a 20 mm.

Ballistic Coefficient. 20mm Vulcan's BC is lousy. These long thin skinny wildcat projectiles have BCs over 1.0. They retain energy and go FAR.

This is similar to Barrett 416 and 375 Cheytac (which are kinda/sorta improved 50BMG.) In the Ultra Long Range game lots of powder behind an extreme BC projectile is the answer. In essence its what 6.5CM did too. Modern bullet designs have spurred on the development of more optimized cartridges.

 

[jcutonilli]

Ballistic Coefficient. 20mm Vulcan's BC is lousy. These long thin skinny wildcat projectiles have BCs over 1.0. They retain energy and go FAR.

This is similar to Barrett 416 and 375 Cheytac (which are kinda/sorta improved 50BMG.) In the Ultra Long Range game lots of powder behind an extreme BC projectile is the answer. In essence its what 6.5CM did too. Modern bullet designs have spurred on the development of more optimized cartridges.

Not sure that it is a real benefit in this area. You are going to be hard pressed to find ranges past a couple of hundred yards in state and the nearby ones out of state top out at 1000 yards.

 

[Blacksmith101]

I would be interested in what the theoretical maximum range of the projectile is?