The Collaborative International Dictionary of English v.0.48:

Gunnery \Gun"ner*y\, n.
   That branch of military science which comprehends the theory
   of projectiles, and the manner of constructing and using
   ordnance.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gunnery
    n 1: guns collectively

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "gunnery":
   archery, artillery, ballistics, casting, chucking, firing,
   flinging, heaving, hurling, jaculation, lobbing, missilery,
   musketry, pitching, projection, rocketry, shooting, skeet,
   skeet shooting, slinging, throwing, trajection, trapshooting