This is a simple fix that reduces the size of the crosshair to about half its original size.
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Prophes0r proposed and tested this fix. Vangald contributed advice in the discussion thread.
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State of Decay bases UI size - including the crosshair - on the width of the screen. Superwidescreen resolutions such as 6000x1080 therefore have a HUGE crosshair as a result. There are a number of files that reference the reticule - or crosshair - but the images it is composed of are in a Scaleform GFX file. This file has both the AS2 script that controls the animation which represents recoil when the gun is fired, and the vector shapes themselves. Changing the values for size, and repositioning, has a direct effect on how large the crosshair appears on screen. The animated crosshairs remain untouched at this time, as there's a lot more work to shrinking those. Reviews indicate the smaller crosshairs are desirable at more common resolutions as well.