To all the players who pick up scorch cannons and empty the shells into low-tier enemies; don't tag Majors/Ultras with the sticky charge round, your teammates/fellow guardians grow irksome at your liberal spraying of super-bullets. As Variks has said, the weapon is very rare and very powerful. Those sticky rounds have the ability to inflict MASSIVE amounts of damage if the charge is allowed to build. Let your teammates pick off that little dreg with half health and an electric-butter knife, your cannon is a bit much for him. Don't be afraid to hold off on the trigger. It's not a sword of Crota, it has ten supremely devastating rounds. Use each and every one to your advantage and your teammates will love you.
Mines need to be shot in the Prison? One charge, let it run full blast seconds. Wanted House of Wolves target? Stick-em and let the enemies group for mass removal as well as insane amounts of damage on the target.
The scorch-cannon. Ultimate in Major removal.
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My general strategy is to stand under the drop ship, pick the biggest target and stick them before the drop. Then let the round charge as they are dropping and let it go once all the enemies are on the ground.