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A calibre is a form of measurement describing the diameter of an object (such as a bullet). One calibre is equal to 0.254 millimeters or 0.01 inches. A fifty calibre bullet is 12.7 millimeters or 0.5 inches in diameter. So high-calibre describes an object (like a bullet) with a very large diameter Other definitions can be found if you Google "define: calibre" or "define: caliber".

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