Sumo Sight ICFRA plots sheets and other downloads.
Here are some ICFRA plot sheets that I made. They work well for me, hopefully they are some use to you. Understand that there is a fair amount of inaccuracy on any short range target if you are not exactly at the designed distance.
This is the Excel spreadsheet I use to determine recommended fullbore ring sizes on ICFRA targets. It also seems very accurate for me. Adjust as needed. Send me comments on it's accuracy please.