Learn something every day. Neighbor has a .308 - common hunting round, sorry, bullet - with a magazine, sorry, "clip" that holds four rounds, sorry, bullets, but it is removable.
Yep. This photo is one .243 hunting rifle I own. Errr, owned...before tragically lost in a surfing accident off the coast of Greenland. Shells are inserted through the top (under the scope. It can hold four. There is a quick release under the gun to remove the bullets later.
This is my .243 Remington Mohawk...was...sadly lost in the same surfing accident. You would load 4 bullets (one in the chamber 3 in the embedded magazine). At the end of the hunting day, you had to manually extract each bullet with the bolt action.
This is an old .20 gauge pump shotgun. You inserted shells via the feed tube at the bottom which would reside in the lower tube. It would hold 3 and you could jam another in the chamber to get 4 loaded. You manually had to pump-eject the shells when done. Sadly, this too was lost in the same tragic surfing accident.