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4 bore
Four bore or 4 bore is an obsolete black powder caliber of the 19th century, used for the hunting of large and potentially dangerous game animals. The specifications place this caliber between the larger two bore and the lesser six bore. This caliber was the quintessential elephant gun caliber of the black powder safari rifles. ==Specifications== The name derives out of an old English practice of bore measurements in gunmaking, meaning a perfectly round pure lead ball that exactly fits the bore of the weapon would weigh 1/4 lb—that is, (see gauge). The 4 bore was made to fire roundballs of 1/4 pound lead, or approximately 1750 grains (1750 gr.) and approximately calibre (more precisely, , when shooting pure lead bullets). This varied greatly as in muzzle loader days shotgun gauges were custom made and often differed from the actual bore measurements. Commonly, 4 gauges were closer to .935–.955 calibre, pertaining to a 1400 gr. alloyed lead ball and closer to 5 gauge.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「4 bore」の詳細全文を読む
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