Complete Book of Rifles and Shotguns by Jack O'Connor

Author:Jack O'Connor [Piers]
Language: eng
Format: epub
Publisher: Pickle Partners Publishing
Published: 2016-01-18T00:00:00+00:00

Varmint scopes are used on rifles designed to take birds, such as crows and harmful hawks, and animals, such as woodchucks and jackrabbits, at long range. Powers run from medium (6X) to high (15X). Some are of the hunting type, with adjustments for windage and elevation in the scope tube, and are of moderate length. Others are of the target type, with no internal adjustments for windage and elevation. They are mounted on micrometer-type mounts which work like micrometers used for measuring tolerances in a machine shop. They “click” for the various graduations—all parts of a minute of angle—½, ¼, ⅛ The minute of angle will change the point of impact 1 inch for each 100 yards of range. That means that a minute of angle has a value of 1 inch at 100 yards, 2 inches at 200 yards, 3 inches at 300 yards, etc.

Target scopes are used in small bore (.22 caliber) shooting and in big bore (.30 caliber) matches. Powers run high, from 10X to 20X, and the scopes have provision for focusing at various ranges: at distances as short as 50 feet for indoor small-bore shooting and as far as 1,000 yards. Many are long and heavy, but that is not a drawback, since target rifles are not carried around. Optical perfection and precise adjustment are the qualities sought. They are always used in micrometer mounts and slide with the recoil.

In addition, many thousands of inexpensive scopes are sold annually which are intended for nothing but .22 rifles. Generally they are not satisfactory for varmint and big-game rifles, because their lenses are not highly corrected, and they are not built to stand the heavy recoil of powerful cartridges.

ADVANTAGES OF THE SCOPE SIGHT

Many believe that the chief advantage of the scope is its magnification. That is one advantage. The principal one is that a scope sight puts the target and the aiming point in the same optical plane. The user of open iron sights has to perform the impossible task of focusing his eye on the rear sight, the front sight and the target, which are all at different distances. Young flexible eyes can make a pretty good stab at it, but older eyes simply are not flexible enough. For the middle-aged man the peep sight makes the task easier because he can look through the aperture, put the front sight on what he wants to hit and then shoot. He has only two points to focus on, and since the front sight and the target are near enough in the same optical plane, he is not bothered greatly unless he is extremely farsighted.

But with a scope sight, the aiming point (reticule) and the target are in the same optical plane, and the middle-aged or elderly man can see like a youngster once more. He can also aim with a relatively smaller, more exact device than the large blob of a front sight. With the better definition that the scope affords, the hunter can not only place

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.