from the article: “A special shell was developed, and after just two nights, 250 units of Russian artillery were destroyed. There is video confirmation for each case,” Fedorov said.
And also:
According to Fedorov, disabling heavy artillery using standard drone drops or conventional shells is highly difficult, as damaged units can frequently be repaired and returned to the front lines. To overcome this, Ukrainian developers engineered a specific munition that targets and ruptures the artillery barrels entirely, rendering the weapons unserviceable.
So a smart munition that can specifically target the barrel.
If you ever watched the WWII miniseries Band of Brothers you’d recall the allies destroyed German artillery by shoving explosives in the barrels. Sounds like this does the same sort of thing but without a squad of soldiers rushing the artillery.
The fact that Ukraine has developed the ability to create a munition like this is just another notch in their ever expanding expertise caused by the war. So amazed at their achievements like this.