Can it fire the full minute without breaking?
That reads more reasonable than this Chinese submarine launched drones with gravitic propulsion systems on East cost of USA can park over the white house mean game over!
The Australian Metal storm prototype from 18 years ago
I would rather ask the following questions:
- How many seconds can it fire before needing a reload?
- How many “projectiles” in each reload?
- What is the weight of the reload?
- What is the minimum time interval between firing adjacent barrels without getting aerodynamic issues with adjacent barrels?
A shotgun fires a lot of pellets per second but the sustained rate of fire is low.
Same for a Claymore mine …
I saw programme on tv a few years ago featuring the original Australian Metal Storm.
The expected rate of fire was around 1000000 rounds per minute.
It was an electro magnetic weapon and no powder was used, barrel wear was negligible and heat build up was also not an issue according to the programme.
Each shell was a cone that stacked in a similar way to traffic cones and could be fired individually, in a volley or all in succession.
The weapon has multiple barrels in order to assist with its rate of fire.
It’s achilles heal is that it is difficult to reload so is more suited static defence than offensive weapons.
It gets a mention on the Buzz on YouTube coincidentally on worlds fastest firing weapons today
So someone has gone to great (government-funded) expense to design and build an overly complex, large-gauge shotgun? 
Impossible, something like that has never happened before …
No caliber is mentioned, however I’m assuming small not in the 20mm range. I’m not an ammo expert, I would think to intercept a hypersonic weapon it would need to be a fair caliber in order to intercept at any distance.
I’m thinking the Chinese only invented a big a@@ bb gun is all.