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Does not re-zero. That would be very confusing indeed
Best bet is a to keep log book with the rifle to keep track of the settings at the distances you will be shooting at, along with what load it was, the conditions, sun angle, wind speed and direction, which shooting position you're firing from, be it resting, prone with sling....etc. Also what targets you are using at which distance, and whether it was a center, 6 o'clock, or sub 6 hold. Temperature, humidity, altitude and if there is a slope from shooting position to target position might prove useful too.
All of these can and do affect your point of aim.
Keep track of all your corrections.
It took me awhile to figure out every rifle needs a log book! I think that's the first thing you should do when you decide to keep a rifle as a regular shooter. Excellent advise Diopter.