This was tested earlier this year. I remember reading about it. Up to 150 km range. But it is a very expensive method to increase range. There is already guided rounds like Excalibur in esoteric price levels. Who knows what these will cost. Also the amount of explosive it can carry will be greatly reduced due to engine, fuel etc.On maybe related news, Boeing & Nammo have successfully tested its ramjet powered artillery projectile.
Boeing, Nammo successfully test Ramjet air-breathing, longer-distance artillery - Breaking Defense
The recent test verified the projectile's flight stability and propulsion system. Next up: guided flight.breakingdefense.com
As Turkey we have our TRG/TRLG-300 missiles that can carry 90-105 kg of explosives to similar ranges and with accuracy, probably at similar cost.
Nevertheless the technology is there and it is possible to shoot targets 150km away very accurately with these rounds.
The range revolution - Nammo
www.nammo.com