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