Not sure if this work on the 360.......Try it anyhow
Ammo Dump
Take a barrel of TNT from the Badlands mine and put it on the north end of the old abandoned house, by the chimney, and the explosion will open up a hole in the ground with unlimited ammunition. To get there, get out of Dodge City and make your way to the Badlands. Head into the field that has a few horses and buffalo. The entrance to the mine is up behind the house.
Unlimited Life
Go to Dodge City. Go to the lower part of the bridge. Follow the path on the other side to reach a beach cave. Look inside for a life power-up which will reappear over time after you leave the area. Note: The cave also contains ammunition and money.
Unlimited Whiskey Bottles
Go to the Indian Hunter's hut, which you can find on your map. Once there, go to the building to the left of the hut, with the stairs going up the side. Go up the first set of stairs, and continue going straight. You should see a spout-type object coming out of the side of the building. Jump onto that spout, and walk toward the wall of the building. If done correctly, you should go through the wall, and into the inside of the house. There is only a small ledge for you to drop onto inside, so move slowly. Once inside, look to your left and you should see three whiskey bottles on the ground. You can pick these up as many times as desired and they will never go away.
Completion Bonus
Successfully complete story mode to unlock Magruder's seven-barrel Nock gun.
Ammo Dump
Take a barrel of TNT from the Badlands mine and put it on the north end of the old abandoned house, by the chimney, and the explosion will open up a hole in the ground with unlimited ammunition. To get there, get out of Dodge City and make your way to the Badlands. Head into the field that has a few horses and buffalo. The entrance to the mine is up behind the house.
Unlimited Life
Go to Dodge City. Go to the lower part of the bridge. Follow the path on the other side to reach a beach cave. Look inside for a life power-up which will reappear over time after you leave the area. Note: The cave also contains ammunition and money.
Unlimited Whiskey Bottles
Go to the Indian Hunter's hut, which you can find on your map. Once there, go to the building to the left of the hut, with the stairs going up the side. Go up the first set of stairs, and continue going straight. You should see a spout-type object coming out of the side of the building. Jump onto that spout, and walk toward the wall of the building. If done correctly, you should go through the wall, and into the inside of the house. There is only a small ledge for you to drop onto inside, so move slowly. Once inside, look to your left and you should see three whiskey bottles on the ground. You can pick these up as many times as desired and they will never go away.
Completion Bonus
Successfully complete story mode to unlock Magruder's seven-barrel Nock gun.