If you’re shooting 6” high at 100 but grouping well, just zero your rifle at 100, probably around 2” high, and it will get you close to dead on at 200. The 2-3” high at 100 from a 25 yard zero is a guideline, not infallible. It will vary with trajectory or height of the crosshairs above bore centerline or a number of other factors. The 25 yard zero is just to get you on paper so you can zero at the preferred range. BTW, welcome to the fire!

Old 70