Here's a tip I found out about Slow on the Draw. It's possible to boost this without actually killing any of the bandits from the Hideouts.
Needs 2 Players Minimum
First have the players get into the Hideout, you'll know when you see a little notification that lets you know you've entered a Hideout. But do not go up to the Bandits, make sure to keep your distance. Have one player keep whistling for his/her horse, when the horse comes up, mount it. Keep a powerful gun equipped (Preferably Sawed off Shotgun, but anything that can 1 hit kill headshot) and aim it at the head of the mount. Have other player equip a weak gun (Cattleman Revolver or Scotsfield Revolver) and shoot the horse twice in its back/midsection. Make sure to not shoot the guy riding the horse! And then the rider shoots the mount in the head. Repeat 9-11 times correctly, the trophy should pop. This will go much faster if there is more players whistling for their horses. This method is much more easier to get this trophy than the one mentioned in the guide.
Will you play for the love of the game or die as a coward?