Hey Beavis, great report. I have done it when i swap from Hornady to Lapua brass and work the treat. this process is better understand if shot a further distance to also check the POI variation, but, the way you done will work also. You got it right at the velocity variation, when you find the so called "flat spot" you get it in the very "middle" and work from there, at least it was what work for me, once you sort it out then the seating depth is a tune in point.
I am not an specialist by any means but keen to help if i can.
Good luck!
Mac
Result achieved from this method…
Sorry but the photos looks like have been drinking all together…
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