The gooner has a lot of niche parts to their kit, the right click damage costs 5 ammo is the value of 2.5 left click head shots or 5 left click body shots so get used to tracking your ammo and using right click on 4 or less ammo remaining for big damage
the right click damage can also splash so when jungling camps you can right click the ground between mobs to splash the damage to all mobs
your slide shooting also uses no ammo so can spam slide right click if you have the stamina for clearing/damage.