Step one: find and mark the center of each indiviual group. Call that the Group POI.
Step two: ignore the actual bullet holes from here on out and only focus on Group POI points.
Step three: find the three Group POI point that are closest together.
That is the purpose of OCI, because now you know that if you load at the center charge, if your scale is off a little bit, or the temperature is higher or lower, your POI will change the least.
Once you get the charge node... then start with seating depth.
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