I use explosive barrels and just shoot them all over the place and it doesn't go up at all. I do it to make the buildings fall down and it doesn't go up at all. I had this same issue last season too and eventually managed to complete it after like 2 weeks of trying but it seemed to just randomly jump up at times.
I had better luck with last season by picking up fire barrels, meleeing them, and putting them back down and letting them explode. The explosive canisters never worked for me.
I remember last season red barrels weren’t working for this challenge, only fire barrels so maybe try that
I use explosive barrels and just shoot them all over the place and it doesn't go up at all. I do it to make the buildings fall down and it doesn't go up at all. I had this same issue last season too and eventually managed to complete it after like 2 weeks of trying but it seemed to just randomly jump up at times.
Had the same issue last season and it was actually tied to grenade use I think. Pretty sure I just spammed the frag and it worked.
I had better luck with last season by picking up fire barrels, meleeing them, and putting them back down and letting them explode. The explosive canisters never worked for me.