[twitchyzero]

basically
that's probably what team deathmatch/goldrush is for
from wiki:

Red Dead Redemption pushes the envelope of the open-world experience. Instead of lobby screens, the player is placed into the single-player map and given the freedom to explore with a lobby consisting of up to 16 people with the additional option of creating a "posse" ranging from 2-8 people. While exploring online the player's experience will share many of the same features which can be found in the single-player experience. At any given time the player is able to roam the country hunting game, search for unassuming, unsuspecting settlers out on the trail, serve vigilante justice by the gun, enjoy the scenic beauty of the expansive map, or assume the role of a lawman seeking to bring order to the chaos that was the west. Gunning down innocent civilians will warrant the same punishment as the character would receive in single-player while the player will be rewarded for completing challenges having to do with serving justice to bandits terrorizing the countryside. As the player climbs the ladder of experience (towards the level cap of 50) they will gain new, pre-selected character skins, titles, weapons, and modes of transportation.

Game Modes:

* Free Roam
* Deathmatch
* Team Deathmatch
* Gold Rush
* Team Gold Rush[8][9]

Within free roam, players have the ability to create groups or "posses" of up to 8 players. Within these groups, players can hunt, battle it out in skirmishes, become outlaws and evade authorites, attack gang hideouts, and other things to be revealed at a later date.[10]

Also similar to GTA IV, the player will gain experience points as they play in the multiplayer modes. There are 50 levels of character progression, with experience points unlocking new weapons, mounts, characters and challenges