Well, since it is already in the game...Ah, as for separate loading animations, not sure where to draw the line there. If you have separate animations for loading, would I then have to add 1-bullet-clips rule? Chambered rounds? I don't want to detract too much from the old-school mentality or gameplay.
It must depend on a real prototype of weapons. MAC-10, for example, shoots from an open bolt, so that fact, that it cannot keep an chambered extra round, is a correct.