Yoo...that's my man.
I like people like these who initiates a healthy conversation, anyways...
So answer this question of yours
No, they were not.
Why? Because they kept the outer diameter of the projectile 155mm. Remember in case of any shenanigans you add to an artillery shell you would have to trade it for effective explosive mass. In a typical vanilla shell you get a certain amount of HE. Add BB to it, it decreases slightly. Add RAP, it further goes down. And in case of guided projectile like Excalibur or Krasnopol the reduction is stark.
In case of ramjet powered projectile you now have to add GNC, CAS, solid propellant and perhaps most "wasteful" air-intake in the same SWaP of a 155mm HE shell.
So in case of NAMMO...
View attachment 195802
The fins are smaller than the OD of the shell. So ultimately despite losing HE charge for air intake and propellant it still benefits from the overall diameter of 155mm.
Now coming to the pic or perhaps why I said they lack knowledge or artillery.
View attachment 195803
See the other diameter?
The explosive content decrease further.
All in all, you posted a pic to counter my argument and the pic was of what exactly I wanted them to make.