For his 1st skill and his ultimate, you can also guarantee critical damage at the last bullet, so this is advantageous for Granger.
You should also be careful, however, since this skill can be interrupted from Crowd Control (Minotaur, Aurora, Atlas, Tigreal, etc. ), so be sure to time this skill properly.
If you use “Rhapsody” and you hit a minion/enemy hero, the cooldown of this skill gets decreased in 0. 5 seconds. Within a max level, if you hit all 6 bullets to an enemy hero/minion, the cooldown of the skill gets decreased in half (6 seconds to 3 seconds).
Use this skill as the last straw for killing heroes, since the usage of both “Rhapsody” and “Rondo” should leave the enemy with low HP. If you decide to use the skill near an obstacle, it will be quicker to release all of the super bullets and move forward into a team fight/lane push.
A good addition to his equipment can be Blade of Despair. This increases his physical attack by 160, and will make him damage-efficient in the game. Avoid using attack speed equipment, including Windtalker, Demon Hunter Sword, and Scarlet Phantom (to name a few). This will instead slow Granger down.