I make them in Corel Draw, "Square on Point" (diamond) 1/2" wide lines, leaves center of sighting area open, put crosshairs across each 'point' of diamond. This is for scope use.
Add grid lines Horiz/Vert for every 1/2" print on 8.5x11 for 100yd, larger format for longer ranges. after bore sight, you are on at the 25M mark, adjust windage and elevation, then go to 100 and get about 1" high, then verify 200yd zero. (well, that is what I do).
In addition, on the outside of the diamond (near the end of the paper) I make 4 solid black squares (1 1.04", 2 2.08", 1 3.12"), so I can tell what 1MOA looks like at 100yds on a specified power, good way to make an impromptu rangefinder out of a Duplex Scope, just by remembering a power setting). If you hold dead center on bottom of largest square (3.12"), you should shoot it and hit dead center and be very near a 200yd zero with scope on a flattop. There are adjustments for this if you have carry handle mount.
"Diamond" in center is about 4" wide (corner to corner).
I can make a .PDF of this target (Extremely useful, and makes it almost 'natural' to line up crosshairs, and leaves a blank spot for spotting your shots).
IM Me if interested, I make them in Corel Draw, Specify 8.5x11 or 11x17 for your printer, but then I export them to Adobe PDF, so they print right on any machine/platform with only acrobat reader.
I sometimes enhance them with the 1" or 1.5" 'high' circle in dotted line to remind me of where I am supposed to be for 200 with most ammo.
For irons, nothing beats a square box, hold 6 o'clock on solid 4" square, but you need to use spotting scope or walk to target to verify. I also put 1/2" gridlines in black on those (until they cross into black square, then they are white lines).
If anybody has an idea for "The Best" Target for Zero and ranges, let me know! This is what I have found to work the best, and would like to improve upon it!