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Small-bore Small-bore refers to calibers with a diameter of .32 inches or smaller.〔http://www.chuckhawks.com/column2_medium_bore.htm〕 It may also refer to small-bore rifle competition. The medium-bore refers to calibers with a diameter between .33 inches up to .39 inches and large-bore refers to calibers with a diameter of .40 inches or larger.〔http://www.chuckhawks.com/intro_big_bore.htm〕 Miniature bore historically referred to calibers under .22. There is much variance in the use of the term small-bore which over the years has changed considerably with anything under .577 caliber considered small-bore prior to the mid-19th century.〔http://www.rifleman.org.uk/index-31.html〕 ==Small-bore competition== Small-bore competition often refers to shooting competitions conducted with .22 Rimfire target rifles.〔http://www.smallborerifle.com/whatissmallbore.php〕〔http://compete.nra.org/documents/pdf/compete/RuleBooks/SBR/sbr-book.pdf Small-bore rifle NRA rule book〕
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「Small-bore」の詳細全文を読む
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