Just an FYI
Be careful when you print or copy targets.
I have used printers and copiers that did not print/copy evenly on the Horizontal and Vertical axis.
The rings on the target ended up as slightly flattened circles, not nice round circles.
Some printers/copiers are worse than others. Some are REAL BAD.
Measure the H and V diameters.
If they are the same or very close, you are OK.
If they are significantly off, look for another printer or copier that will make a better circle.