Me, my father in law, and my brother in law were hunting moose and we were scanning with binos from my boat in a large lake, when he said I see a moose moving! So we went ashore downwind to where we saw it last. We walked about 50 meters in and a bull moose stood up around 75 meters off. We took our time and shot, and it goes behind a stand of trees and falls down. When we walked up to it, it was drawing its last breath. It was now around 11 am, and we were getting hungry. My brother in law had left his food in the boat, so he said he would walk down there and get his food, and get our father in law, who was staying with the boat, to come up. I opened my pack and took out a bottle of water and had a drink. I heard the underbrush rustling to my left, and when I looked up there was a bear not 20 feet from me. I said to him "what do you want" figuring it would run off. It looked at me for a few seconds, and then made a few steps closer. When he did that I grabbed up my rifle, slammed in the mag, and worked the bolt to chamber a round. I said to him, louder this time, "that's my moose, get the f##k outta here!" By that time the bear could see the other two who had walked from the boat and took off. My brother in law asked why did I have my rifle up, and I told him about the bear. We determined that it was the bear he saw from the boat, and the moose must have been bedded down and got up when he heard us. The bear was lucky I did not have a tag, because he would have been lying next to the moose in the boat.