It tore a whole through the sky AND Split the heavens accroding to Oda in Road to Laughtale Part 4 Booklet.
Oda stated the vibrations could be felt 1000 miles away and it broke through Kaido's giant magma dragon enhanced with his advanced armament and advanced COnqueorros Haki.
Barjrung Gun is the strongest attack in the series. This attack is stronger than a continent in DC And AOE.