Choosing the Right Sight
By Chuck Hawks
The usual sight options for hunting rifles are open iron sights (from buckhorn to express), aperture sights (tang, receiver, peep or ghost ring), and optical (telescopic) sights. Open iron sights of one sort or another are supplied on many rifles, the other types must usually be purchased separately and installed by the rifle owner.
Open sights consist of a rear sight and a front sight. The rear sight is typically an upright, transversely mounted metal blade into which has been cut a "V," "U," or square shaped notch. It is usually secured in a dovetail slot or screwed onto the rifle barrel toward the breech end so that the notch lines up with the shooter's eye. The front sight takes the form of a vertical blade or post dovetailed, screwed, or sweated onto the muzzle end of the barrel, often on some sort of ramp. Sometimes it is protected by a removable metal hood. The idea is to center the front post in the rear notch, keeping the top of the front sight level with the top of the rear sight (as seen by the shooter's eye). When correctly zeroed, the bullet should hit right at the top of the front post.
A gold, ivory, or red colored bead is often affixed to the face of the front sight to enhance visibility in dim light. I have used all of these, and for hunting I prefer the traditional gold bead (actually a brass alloy), as it is more durable than colored plastic beads.
One problem with all front sight beads is that they tend to shoot away from the light. Their curved surface reflects a highlight in the direction of the sun, which becomes a false aiming point. This is one reason why a non-reflective black, flat-topped front sight with an undercut face is the most accurate type of front sight. Unfortunately, it is also the least visible in dim light.
The most common type of open rear sight, often supplied on factory produced rifles, consists of a simple, flat-topped, "U" notch rear sight dovetailed onto the barrel. These sights are usually adjusted for elevation by means of a stepped slider and for windage by drifting them laterally in their dovetail mounting notch.
Other types of reasonably common open rear sights include the express sight with its shallow "V" (more about which later), the buckhorn, and the semi-buckhorn. The buckhorn type looks like a standard rear sight with a small "V" notch and large ears or wings sweeping up from each side of the rear sight, which nearly meet directly over the center of the sight. The effect is something like the upper half of a ghost ring grafted onto a standard open rear sight mounted on the barrel, and cut away at the 12 o'clock position.
On the semi-buckhorn rear sight the sweeping ears of the buckhorn sight are reduced to a bulge on each side of the central notch. The semi-buckhorn rear sight, as seen from behind by the shooter, takes the form of a wide, shallow "U" with a much smaller and more precise "U" or "V" shaped aiming notch at its center. The standard Winchester Model 94 and Marlin 336 rifles are supplied with semi-buckhorn rear sights.
There are, of course, many variations and some open rear sights are screw adjustable for windage and elevation. Remington and Ruger rifles, for example, often come with screw adjustable rear sights. The Williams Company has a rather complete line of fully adjustable open rear sights. Like the other types, open iron sights have advantages and drawbacks. Among the advantages are the following.
Then there are the following disadvantages.
For all of these reasons, simple open sights of the type supplied with most factory rifles are the least versatile and least accurate of all commonly encountered rifle sights. In the hands of an expert they might allow a 200 yard shot at a medium size big game animal. In the hands of an average marksman and deer hunter their use should be limited to about 100 yards. They are best used as emergency sights only, in case the primary sighting system is somehow disabled. Better yet, of course, is a spare rifle with decent sights.
The express sight is one type of open sight that is still useful. It consists of a very shallow, wide "V" (usually with a white line marking the bottom of the "V") combined with a large, low, gold or white front bead. The "B" blade for the Williams WGOS sight is a good example of an express rear sight.
The express is a specialized sight used for hunting dangerous game and is commonly fitted to double-barreled and other "Express" or "African" rifles. I believe it was developed by the British, who had a penchant for hunting dangerous African and Asian game, but not for being eaten or trampled. Its purpose is to allow a fairly well aimed shot over moderate ranges when there was time for careful sighting, and to allow the rifle to be pointed like a shotgun to stop the charge of a dangerous animal at very short range when there wasn't time for aiming. In the latter capacity the sights are ignored and its utility is merely that it interferes less than other sights with pointing the rifle.
Like open sights, aperture sights are iron sights. They are also called "peep" sights and more recently "ghost ring" sights. They use a front sight similar or identical to open sights, but the rear sight is simply a small ring mounted close to the shooter's eye. Aperture sights can be variously mounted on the tang, cocking piece or receiver, depending on the type of rifle. Because the rear sight is much closer to the shooters eye, the sight radius is considerably longer than with a barrel mounted open rear sight, increasing the intrinsic accuracy of the sights.
The shooter looks (peeps) through the rear sight's aperture, attempting to focus only on the front sight and target. (Still impossible, but less so than the three focus points required by open sights.) The eye automatically centers itself in the rear aperture, which is seen only as an out of focus blur (or ghostly ring).
Do not use a target disc (an insert with a tiny hole that screws into the rear aperture sight) in the field. These increase the eye's depth of field for target shooting, but restrict the light reaching the eye and the field of view. Target discs can be unscrewed from receiver sights that are supplied with them.
The closer the aperture sight is to the eye, the faster it is to use. The old fashioned tang mounted sights sometimes seen on lever action and single shot rifles are probably the fastest of all iron sights. They also provide the longest possible sighting radius However, they should never be used on powerful rifles, where the recoil and the consequent muzzle jump can drive them into the eye. The best compromise, particularly for a powerful rifle, is probably to mount an aperture sight on the rifle's receiver.
Because they are optically superior to open sights, aperture sights are more accurate. A good shot should shoot 100 yard groups perhaps 33% smaller with an aperture sight than he or she could with factory open sights. Aperture sights also obscure much less of the target and the surrounding area than open sights, and are faster to acquire. Most aperture sight designs allow accurate, repeatable, windage and elevation adjustments.
Receiver mounted aperture sights have been supplied on most infantry rifles for the last 70 years or so and they are probably the best all-around type of iron sights for the hunter. Many, many years ago, before the introduction of practical and reasonably priced telescopic sights, aperture sights were the first choice of savvy riflemen.
A conventional scope offers magnification for better target definition at long ranges and the finest potential accuracy of all sights. A decent scope should cut 100 yard group size about in half compared to aperture sights. It can be affected by inclement weather, such as heavy rain, but usually isn't. I live in Western Oregon, an area famous for its rainy weather and where we do most of our deer hunting in the rain. I am reasonably careful with my guns and scopes and I can truthfully say that I have never missed a shot because my scope's lenses got so wet that I couldn't aim through them.
The telescopic sight's most important attribute is that it puts the target and the aiming mark (crosshair or whatever) in the same optical plane. There is no need for the eye to attempt to focus on two or more objects at different distances.
To use as scope, just look through it and place the crosshair where you want the bullet to hit and squeeze the trigger. The view through a good quality scope is bright and clear, with everything in the field of view in the same optical plane.
Scopes are also quite durable, which is surprising to the uninformed. A scope is probably no more likely to be knocked out of alignment that the iron front sight on most rifles.
The following are among the advantages of telescopic sights.
Telescopic sights also have disadvantages, among which are the following.
Theory aside, almost anyone who has done a reasonable amount of hunting with open sights, aperture sights, and telescopic sights quickly learns that a high quality scope of appropriate magnification is far superior, on balance, to any type of iron sights. As scopes have improved, so has their acceptance by hunters. In 1900 telescopic sights were rare on hunting rifles. In 1950 many hunters had adopted telescopic sights, but many still used iron sights. Today the telescopic sight is the nearly universal choice of serious hunters. For more information about scopes, see my article "Telescopic and Red Dot Sights," which can be found on the Scopes and Optics Page.
Copyright 2003, 2008 by Chuck Hawks. All rights reserved.