While "magazine" is correct, "clip" is an accepted term for the part of a firearm that hold bullets.
Bullets are to cartridges as flour is to bread, as cement is to concrete, etc. Please learn the terminology of any technical matter upon which you wish to discuss.
Oh, brother... Give it a rest.
Only by the uneducated or misinformed. Both clips and magazines hold cartridges, not bullets. With very few exceptions, such as the M1 Garand rifle, clips are used to feed magazines, not firearm chambers.