So am I. It’s strictly a what-if scenario. I didn’t choose it because I liked it as a weapon. I chose it because it met a list of criteria. It needed to viable early in the war while Germany had full use of their submarines against supply ships and before the UK built the Tallboy. this was when Germany had the most control of their airspace.
No, that was the point of the design. The muzzle velocity was due to a series of addition small charges of explosives and not some monster sized charge. It’s easier to imagine this as a rocket launcher where the acceleration is based on continuous fuel burn and not a big explosion that tears up the bore.
It wasn’t a rifled bore. It was smooth. the projectiles were finned for stability.
My what-if is not a singular event. It’s the acknowledgment that England needed to be removed from the war before attacking Russia. And it’s likely the Tizard Mission would have created the same technological results. If the UK sued for peace and the US stayed out of the war then it’s likely that the US and UK would have entered the war years later with airborne radar and the ability to decode the 4 rotor Enigma. It would have meant a significant increase in supplies reaching the UK. It would have meant new ships designed to hunt submarines using the highly successful Hedgehog bombs and a fleet of new US Navy ships.