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Gunner's Bible 在线电子书 pdf 下载 txt下载 epub 下载 mobi 下载 2022


Gunner's Bible

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发表于2022-10-01

Gunner's Bible 在线电子书 epub 下载 mobi 下载 pdf 下载 txt 下载 2022

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Gunner's Bible 在线电子书 pdf 下载 txt下载 epub 下载 mobi 下载 2022



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Gunner's Bible 在线电子书 图书描述

Daily practice with a given gun over a period<br >of several weeks will make you a better than<br >average marksman, at least with that particular<br >gun. Some pistol coaches even require that team<br >members fire only every other day to avoid<br >going stale. The fact remains that, whether you<br >shoot daily or only every second day, you ll<br >develop some degree of skill which can t be<br >matched by a shooter who fires only occasionally.<br >This skill will come to you even ff you don t<br >grasp what goes on within a firearm when you<br >shoot it.<br > However, if you ll combine consistent prac-<br >tice habits with some understanding of ballistics<br >-the science of projectiles-you ll become truly<br >expert in less time and your shooting fun will be<br >multiplied hundredfold. When you understand<br >the "why" of shooting, the "how" becomes<br >Caliber<br > "Caliber" is the term applied to the interior<br >diameter of a rifle or pistol barrel or to the di-<br >ameter of a bullet. In English-speaking coun-<br >tries this is indicated in hundredths or thou-<br >sandths of an inch (.30) or (.308),<br > Sometimes caliber indicates ,bore diameter-<br >that is, measurements made from the top ,of the<br >lands or raised surfaces between the rifling<br >grooves within a barrel. A typical example of<br >this is the .30 Remington which, ff measurements<br >were made from the bottom of the rifling<br >grooves, would be .308. The same is true of<br >other .30 calibers irrespective of manufacturer<br >and what it boils down to is that a .30 caliber<br >is actually .308 inches in diameterl<br > Many .30 caliber loads exist, of course, in-<br >eluding the .30/30, ,30/06 Springfield, .300 Hol-<br >land & Holland, .300 Savage, .308 Winchester,<br >and others. Bullets for these loads may be in-<br >terchangeable since they all use projectiles .308<br >inches in diameter, but the cartridges themselves<br >may be fired only in rifles specifically designed<br >for particular loads due to variations in the shape<br >and powder capacity of the shells. In other<br >words, a .30/06 cartridge cannot be fired in a<br >.30/30 rifle-even if both are .30 caliber.<br > Even the date of original issue is sometimes<br >included in caliber designation as is the case with<br >the .30/06 Springfield. The ".30," of course, in-<br >dicates bore diameter. The "06" is an abbre-<br >viation of the year (1906) during which the<br >load was issued to the U. S. Army and "Spring-<br >field" is the name of the rifle, taken from the<br >armory where the guns were manufactured. The<br >Rock Island Armory also turned out these weap-<br >ons.<br > Often, too, commercial developers of car-<br >tridges have given their names to calibers so<br >that the latter have become household words<br >among shooters. Among these are the .30 Rem-<br >ington, .270 Winchester, .300 Savage and .300<br >Holland & Holland.<br > Calibers originating in countries where the<br >metric system of measurement prevails are likely<br >to be indicated in millimeters. The 8/57 R mm,<br >for example, has an 8-millimeter-diameter bul-<br >let. The second figure, 57, is the length of the<br >cartridge case or shell given in millimeters while<br >the "R" is applied, to a shell whose base is<br >rimmed. Fore i~m e~libers are also associated<br >with their originatorsl~y adding the latter s name,<br >as is the case with tl~ 8 mm Mauser.<br > The confusion of calibers carries into the pistol<br >field, too. The .38 Special fires a bullet .357<br >inches in diameter so that,<br >.35! Confusion was further<br >in reality, the .<br ><br >

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