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Bore-axis The bore axis of a firearm is the axis which goes through the center of the barrel. In a rifled barrel the projectile will spin around the bore axis as it goes through the barrel. ==Bore to Sight Distance== It is normally desirable to keep the sights of a firearm as close to the bore as possible, since a firearm with a large bore to sight distance will require more sight adjustment when shifting between shooting at different targets at close ranges. On the other hand, a firearm with a short bore to sight distance will need less sight adjustment when changing between targets at close ranges. At longer ranges the bore to sight distance will be of less importance, since gravity has affected the projectile so much that the height difference between the bore and the sight has less to say in total, compared to the bullet drop.
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「Bore-axis」の詳細全文を読む
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