Board Thread:Questions and Answers/@comment-27528236-20160308151952/@comment-25220796-20160311134431

Do Rescue the Princess (at assassins creek), and Outlaw camp missions. Or just only do the outlaw camp missions and save up to get the Longshot Repeater. Then, keep doing outlaw camp to try and get the Black Steam Horse, and with that horse, do the Los Arcos missions.

Thats what I did 2 years ago to get myself the Flak Cannon, and Doom Bringers (150,000 coins, and 250,000 coins respectively).