@McTag,
Not at all. Just that the ONLY thing which is going to actually ever come close to holding 3000 rounds of any sort of ammo is going to be a machinegun belt.
A "clip" was typically something which held a certain number ( 5 - 8 or so) of cartridges for a normal battle rifle, in such a way that the cartridges could be quickly transferred from the clip to the rifle. A MAGAZINE is the detachable piece of a modern military rifle or pistol which carries cartridges. Typical would be a magazine carrying 20 or 30 cartridges for an m17 or AK style weapon. Those weapons can basically be reloaded by simply detaching the empty mag and attaching a full one.