Scaling up is no the problem scale down can be but they are already working on a 50 cal. smart round.
Back in the 80’s the Navy had a program for rocket boosted shells for BBs..maximum range was about 200 miles, which would have put about 90% of the world’s population within range. It was abandoned when they decision was made to mothball the BBs...they were too expensive to man and maintain.
Forget a new Air Force bomber. Take the Navy’s rail gun, make it 10 times bigger, station it in the middle of the US and launch GPS projectiles into space. We could strike anywhere in the world in minutes, dirt cheap.
My battle station was as first loader in a 5” 38 gun mount. That was when rounds were hand loaded. I would assume they autoload now. Anyway we drilled, but never got to fire a shot in anger! I was out by the fall of ‘64.
Could a land-based rail gun sling a projectile into space? That would seem to be an efficient way of placing guided kinetic projectiles into a wait-til-we-need-you orbit.
No 16 inch guns anymore.
This has already been done years ago.