SLRC was always a fairly ambitious project. The goal was thousand mile range for projectiles that were $500,000 in terms of cost. That was always going to be hard to achieve; witness the USNs 155mm debacle.
Said USN 155mm Debacle is made worse considering that the Army has made projectile with similar range at lower cost and half the size. The Excal round shot from a long barrel 155mm reach out almost 44 miles, about ten miles less then the best AGS shot, back in December 2020 without the use of Rocket Assistance. With rocket assistance shells or just the AGS longer barrel you can hit 50 plus miles easily.
And there are new shells design, like the Nammo Ramjet shell, that will allow even more range.
The Army been shown to be far better about guns then the navy have been. Add in that the Army has all but basically out right said that they are not going to try this if they are limited to 155mm... I can see it being done, the physic check out.
The M65 Atomic cannon lobbed a shell up to 40000 feet in the late 50s and 60s when they shot high angle which is about 20k higher then a 155mm can reach. Adding in the Excaliber shells glide trick, you can get some pretty hefty range from gliding down at that height. Throw in Ramjet or Rocket Assistance, you can get over 200 miles easy. Design the shell right, well who knows?
As for cost, that is a big issue. But considering that the price of scale will bring this down hard like it did with the excaliber shell, which went from 120,000 dollars a shell to about 50k a pop. Which is far cry from the almost 1 million dollar a shell the fucking LRLAP was.
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