User blog:MarkvA/Double XP weekend!

Yes, Rockstar announced that because of the release of the Legends and Killers DLC today (Friday 13th August) at 1PM eastern time all games, including co-op and free roam will earn double experience. So those who need that horrible How the West Was Won achievement or the Legendary achievement, this is your chance!

"Whether you're adventuring the open expanses of Red Dead Redemption's revolutionary Free Roam, teaming up with friends to tackle one of the six unique Co-Operative Missions in the Outlaws to the End Co-Op Mission Pack, or going head-to-head with other players in one of the game's Competitive Modes - including the Legends & Killers Pack's nine new multiplayer maps - all online multiplayer activity this weekend will earn you twice the experience points."

- Rockstar

So, pick up your ammo and kill 'em all!