Gun Cheats

Cheats

Unlockable: Reed's armored horse and Macgruder's cannon shotgun
Finish story mode and all side missions for 100% completion. Then go to Macgruder mine to pick up your rewards.
Unlockable: Apache Shirt
Finish the Hunting Missions.
Unlockable: Silver Spurs
Finish all Pony Express Missions.
Unlockable: Dual Peacemakers
Beat Hoodoo Brown.
Unlockable: Cavalry Sword
Beat Reed.
Unlockable: 69 Ferguson Rifle
Beat Hollister.

Hints

Hint: A Hole In The Wall
If you take a barrel of TNT from the Badlands mine and put it on the north end of the old abandoned house's chimney. The explosion will open up a hole in the ground with unlimited ammunition.

To get there, get out of Dodge City. Make your way to the Badlands (use your map for directions) and head into the field that has several horses and buffalo. The house and the mine with the TNT will be right next to you.
Hint: A Hole In The Wall 2
In Dodge City go over the lower part of the bridge and follow the path on the other side to the beach cave. Inside is some ammo, money, and life pick-up which often respawn when you leave and revisit the area.
Hint: Hunting Game
If you happen to miss a mark when hunting game, you can always depart for other areas and force the game to respawn the target upon your return. Try not to miss the next time around.
Hint: Quarry Respawn
If you scared off the quarry in the Hunt side-missions, just remember where it was and go to the nearest trader. After you talk to him and return to where the animal disappeared, it will be there again.