.303 may refer to:
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.303 British, a rifle cartridge
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.303 Savage, a rifle cartridge
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Lee–Enfield
The Lee–Enfield or Enfield is a bolt-action, magazine-fed repeating rifle that served as the main firearm of the military forces of the British Empire and Commonwealth during the first half of the 20th century, and was the British Army's st ...
rifle
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''.303'' (film), a short film
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