The Collaborative International Dictionary of English v.0.48:

Musketry \Mus"ket*ry\, n. [F. mousqueterie; cf. It.
   moschetteria.]
   1. Muskets, collectively.
      [1913 Webster]

   2. The fire of muskets. --Motley.
      [1913 Webster]

WordNet (r) 3.0 (2006):

musketry
    n 1: musketeers and their muskets collectively
    2: the technique of using small arms (especially in battle)

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "musketry":
   A-weapons, antiaircraft fire, archery, armament, arms, artillery,
   ballistics, biological weapons, casting, chucking,
   conventional weapons, cross fire, curtain fire, deadly weapons,
   direct fire, dry fire, file fire, fire, fire of demolition,
   firepower, fireworks, firing, flack, flak, flinging, ground fire,
   gunfight, gunfire, gunnery, gunplay, heaving, high-angle fire,
   horizontal fire, hurling, instruments of destruction,
   interdiction fire, jaculation, lobbing, machine-gun fire,
   missilery, mortar fire, munitions, nuclear weapons, ordnance,
   percussion fire, pistol fire, pitching, projection, raking fire,
   rapid fire, ricochet fire, rifle fire, rocketry, shellfire,
   shoot-out, shooting, side arms, skeet, skeet shooting, slinging,
   small arms, thermonuclear weapons, throwing, time fire, trajection,
   trapshooting, vertical fire, weaponry, weapons, zone fire