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| 20-gauge shotgun ： ウィキペディア英語版 |
20-gauge shotgun
The 20-gauge shotgun is a type of smoothbore shotgun shell that is smaller in caliber (.615) than a 12 gauge (.729). It is often used as a beginning shooter's practice round and is noted by its yellow hull.
==Description==
It takes 20 lead balls of the diameter of a 20-gauge shotgun bore to equal one pound, while it only takes 12 lead balls of the diameter of a 12-gauge shotgun bore to equal the same amount. A 20-gauge shotgun is sometimes considered more suitable for hunting certain types of game, because it damages less meat, which makes it suitable for most game birds.
The 20-gauge shell is the only shell with a mandated color: yellow. This is to make 12 and 20ga shells easily distinguishable and to reduce the risk of damaging the firearm or unintentionally harming another individual.
This is because a 20-gauge shell will typically fit into the barrel of a 12 gauge, allowing a 12 gauge to be chambered behind it, leading to a dangerous barrel obstruction condition.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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