How to Kill a Whale With a Rifle

The harpoon is 70 millimeter, but the barrel on the canoe is 60 millimeter. In the front of the harpoon we have, of course, the grown out. We explode inside the whale. It's instant if you don't kill it, maybe make it unconscious and then they kill it with the rifle. And how big are they? Could be up to 10 meter. What do you do with the blubber? We give it to the birds.