Generally, all long guns that are not auto/semi-auto must be cycled after every shot in order to chamber another round. This includes pump-action, bolt-action, and lever-action rifles/shotguns. There are exceptions, such as revolver rifles.
There are also instances when semi-auto pistols might need to be cycled after every round.
Surprisingly, Coriolis at extreme ranges (like 5000 feet) can be relevant enough to be corrected for, but how much and in what direction depends which way you're shooting and where on the planet you are. There's a fun calculator here: https://codingace.net/physics/coriolis_effect_shooting.html
* People pumping shotguns after every round, or unnecessarily cycling the bolt after every round
* Wrong action type for the gun
* Wrong shotgun ammo for the context
* Wrong safety type for the gun (most long guns have safeties, but they are operated in a variety of ways)
* Magazine vs clip vs chamber vs tube
* Shotgun impacts launching people across rooms, or unrealistic recoil (both too high and too low) for the weapon type