New combat scope reticles and graticules

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Added 5-7-01
Updated 16-3-10

New Optical Scope Graticules.

The iron sights fitted to any new rifle should be usable in the same way as those of the current M16A2. However, future rifles issued to infantry squads are likely to have optical scopes too. An idea worth investigating is that of the long eye relief scope, mounted ahead of the receiver. These have been used in combat on the Kar 98 and is said to contribute to the snap shooting capabilities of Jeff Cooper's Scout rifle concept.
Any assault rifle scope should be capable of being quickly changed between two modes – x1 magnification for close combat and x3-4 for longer range shooting. One of the graticule options for the H & K G36 has a lot to recommend it. The basic design is a set of crosshairs with a circle around their intersection.

The cross hairs are zeroed to 200m.
Where the bottom of the circle crosses the vertical line is the impact point for a bullet at 400m.
Two marks further down on the vertical line indicate the impact points at 600m and 800m.
The internal diameter of the circle corresponds to the height of a 1.75m (5’ 8”) tall man at 400m, half its height a man at 800m or head to waist at 200m.
In the left lower quadrant of the field of view are four sets of vertical brackets, labelled “2”, “4”, “6” and “8”. These indicated a man's apparent size at 200-800m.
Where the circle crosses the horizontal line gives the correct lead for a target at 200m moving at 15km/9mph. This approximates the “two points of aim aim” used with an M16A2s iron sights in the USMC Rifle Marksmanship MCRP 3-01A. The centre of the front sight post centered on the leading edge of the moving target is considered one point of aim. This is the same as placing the corner of the post on the intended target. The trailing edge of the front sight post held on the leading edge of the moving target is considered two points of aim.

It should be possible to create a similar graticule that use the same sighting protocols as the iron sights of a M16A2. Single lead or One point of aim is given in FM 3.22.9 page 7-38 as 0.8” at 15m, 8” at 150m, 16” at 300m, so is just under 5 MOA.
This sight might resemble:-

One point of aim is used for:-

A strong wind at 200m or a medium wind at 200-300m.
A running man (3m per sec) at 100m.
A fast walking man (2m per sec) at 200m.
A slow walking man (1m per sec) at 300m.

Two points of aim are used for:-

A strong wind at 200-300m
A running man (3m per sec)at 200m
A fast walking man (2m per sec)at 300m

        Half the width of the circle, or the distance between the two “one point of aim” marks is equivalent to 18” at 300m. A frontal figure wider than these marks is within 300m range.
        The diameter of the circle is equal to 2ft at 200m, 3ft at 300m and 6ft at 600m, giving a quick and easily remembered method of range estimation. If a standing man appears to fill ¾ of the circle, range is around 800m and the graticule gives an aiming mark with the correct holdover.

Notes.
        Diameter of circle is 12 MOA, with "One point of aim" marks being 3 MOA to either side of the crosshairs.
        Aiming mark for 400m is 3.3 MOA below centre, for 500m 7.5 MOA (just below the bottom of the circle), 600m 13 MOA, 700m 20 MOA and 800m 29.5 MOA.

UPDATE

        Been playing the video game “HALO”, and one way to tell what weapon you are using is by the the reticle displayed on your HUD. Some of the alien weapons have novel arrangements such as an X of isocellese triangles, an inverted Y or a dot and two brackets.
        This got me wondering about minimising the reticle for better field of view, so here is what I came up with (right).
        The “ ° ” is the Battle Zero (BZO) of 300m, and the two “=” help the eye locate this.
        The vertical line is the bullet trajectory plane, and is marked with impact points at 400, 500, 600 and 800m
        The distance between the two brackets corresponds to a man's shoulder width at 300m - if he fits the brackets or bigger - shoot point blank. There is a set of brackets half the width at the 600m mark.
        The < and > are lead markers, and give the correct lead angle for a walking man -about 7-8” at 100m. 14-16” at 200m if using a 5.56mm. These marks can be changed if a round with significantly different time of flight is used, or if the user desires a lead marker for a faster moving target.
        How to use -put the vertical line on your target (or parallel) and compare him to the two sets of brackets - then put the appropriate mark on the vertical on your target, allow for wind, and shoot.

Shotgun Reticle
One of the simplest but most effective reticles on the HALO game is that for the shotgun - just a circle. If it is in the circle, it's dead.

        You could calibrate this to represent an inch per yd/m of range. As a rule of thumb the pattern from a true cylinder gun spreads about an inch per yard of range. A full choke gun spreads about half this rate.
        We could have a reticle that has two circles - the outer that would cover an area such as 30” at 30yds or 12” at 15yd. 75 MOA is probably a good size to use. The inner circle would be half the width, so a sort of donut.
        What about slugs? You could put a dot in the centre, but given the trajectory of a shotgun slug that is not that honest. Probably better to drop a vertical line from the centre, marked of in 20-25m increments. How accurate this is will depend on how you zero your slugs, but it may prove useful in judging the fall of your shot pattern too -so at “long range” you put your circle above the target

UPDATE
My friend Ed suggested that something like the Shotgun sight would also be better for the rifle/LMG sight, since the eye naturally tends to seek the centre of circles. Below is a new suggestion for a graticule based on this idea.

        Width of the outer circle corresponds to shoulder width at 300m, or 6 MOA diameter. The distance from the “ ° ” to the top or bottom of the outer circle is equivalent to the apparent height of a man's head at 300m. A target who's shoulders fit between the “ ° ” and one side of the circle would be at 600m, etc.
        The aiming point for a target at 400m is designated by an inverted V , while those for 500m, 600m and 800m have a 5, 6 or 8 beside them. The 600m aiming mark has brackets the equivalent of 3 MOA apart.
        This system lets the shooter rapidly assess if the target is within 300m and can be engaged by point blank fire. It also lets the shooter judge if the target is closer or further than 600m. By comparing the target's apparent size to both the outer circle and the “6 bracket” he can judge which aiming mark is most suitable.
        Most of these markings will only be noticable when the scope is magnifying the image. Viewed x 1 the central design will just look like a red topped lollypop, covering 2” of the target at 30m and 6” at 100m.

Further UPDATE
        Inspired by the sights in the “Rainbow Six” game I've added what I call “Pyramid lines” to the above design. When shooting with magnification targeting is a case of putting your target within the circle and placing the point of the arrow/pyramid where you want the bullet to go. When shooting without magnification at shorter ranges just place the circle/lollypop at the apex of the pyramid on the target.

New Update
I originally wrote this article in July 2001. Since this article was first webbed the Trijicon Advanced Combat Optical Gunsight (ACOG) Scope has come into common usage with US forces.

The ACOG reticle incorporates many of the features I have suggested above. I'm a little unsure of the Chevron as an aiming point so have drawn and alternate version (right) using more of the ideas detailed above. This design of reticle would be useful for both ACOG and M68 CCO type sights.

Diameter of the circle coresponds to a man's shoulder width (19”) at 300m, or 6 MOA.

If the target is larger than the circle the shooter engages with the 200m aiming mark. He just places his intended target at the top of the triangle. If he suspects the range is greater than 200m he selects an aim point between the 200m and 300m marks.
If the shoulder width of the target fits inside the circle the target is engaged with the 300m mark.
If the width of the target is smaller than the circle the shooter raises his point of aim until he finds a horizontal line of the same width. If there is no exact match he brackets the target between the two nearest matches.
For small targets at shorter ranges the 100m aiming mark can be used at this range. The 200m mark can also be used to engage small targets at 50m. The 300m mark can also be used to engage targets at 30m

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