The Collaborative International Dictionary of English v.0.48:

Marksmanship \Marks"man*ship\, n.
   Skill of a marksman.
   [1913 Webster]

WordNet (r) 3.0 (2006):

marksmanship
    n 1: skill in shooting

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "marksmanship":
   ability, address, adeptness, adroitness, airmanship, artfulness,
   artisanship, artistry, bravura, brilliance, capability, capacity,
   cleverness, command, competence, control, coordination, craft,
   craftsmanship, cunning, deftness, dexterity, dexterousness,
   dextrousness, diplomacy, efficiency, expertise, facility, finesse,
   grace, grip, handiness, horsemanship, ingeniousness, ingenuity,
   know-how, mastership, mastery, practical ability, proficiency,
   prowess, quickness, readiness, resource, resourcefulness,
   savoir-faire, savvy, seamanship, skill, skillfulness, style, tact,
   tactfulness, technical brilliance, technical mastery,
   technical skill, technique, timing, virtuosity, wit, wizardry,
   workmanship