Sure, why not unload it?
You're putting a spring under tension and it's going to weaken over time if you keep doing it.
EDIT: What he said.
Originally Posted by coachster
it's fine to store BB's in there just don't wind it up. if you already wound it up, pull the little tab and release all the BB's so the spring isn't under tension.
Ár skal rísa, sá er annars vill
fé eða fjör hafa. Sjaldan liggjandi úlfur
lær um getur né sofandi maður sigur.