Using angular measurement between sight/bore instead of a zero distance that POI occurs under specific environmental conditions. Hornady, gunwerks etc are promoting it as a superior method for long range ballistic solutions. Not really new, has been used for a long time in artillery I believe.
https://www.gunwerks.com/blog/lrp-bl...zero-range-323
https://hornadykestrel.com/faqs/question/view/id/729/
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