Bullets, shells etc. (4)
I believe the answer is:
ammo
I believe this is a double definition.
'bullets' is the first definition.
(I've seen this in another clue)
'shells etc' is the second definition.
(I've seen this before)
(Other definitions for ammo that I've seen before include "Bullets, shells, rockets etc" , "Bullets, say, in short" , "Bullets, shells (colloq.)" , "Projectiles" , "Shot" .)