The Olympia has really high damage potential, but its long reload times hold it back after round 30. You can work around this by equipping Deadshot – Dead Again and Death Perception – Critical Eye. Random body shots count as crits and return ammo to the magazine.
It deals 62,370 damage per shot if you land all six pellets. You fire four rounds at 240 RPM before a 2-second reload.
Do not use the Short Barrel! It’s an M14-gang conspiracy. The description refers to a multiplayer mechanic where damage is capped to four of the six pellets fired, but that mechanic never existed in Zombies. Even without the Short Barrel, you deal damage with all six pellets. The Short Barrel only slightly increases reload speed at the cost of a massive range penalty and much wider hip-fire spread.
This gun really shines with Free Fire Gobble Gums or anything that lets you skip reloads so you can do massive boss damage if you get up close. For normal play though, its reload times are so long that it struggles in higher rounds despite good damage.