Good chance you zero not perfect at 200.
Best practice is 100m or yard zero as yocan really get it perfect .
If your zero is perfect trust the app doing the validation in the kestrel
Honestly watch Tod hodnet's videos on truing he really knows his shit.
1.3 inches seems quite low for above bore height to.
I do heaps of validation shooting and in your case I'm picking its something simple.
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