A very nice demonstration video about how to effectively pack a wound with a bleeding artery, using z-fold gauze.
https://www.youtube.com/watch?v=2qBvQJ_N95s
Pressure has to be applied directly to the bleeding artery, to stop the bleed, not just pack the cavity full of gauze.
While #haemostatic #gauze is great, if you don't have it available normal gauze will also do a good job. Multiple gauze packages may be needed.