This is the case if:caus yr group moves a inch from near zero the next day.
- you have a not particularly mechanically precise rifle, and don't fire enough rounds when zeroing/checking zero to accurately determine mean point of impact, OR
- you have a flexible stock or a poorly bedded action, OR
- you do not set up a consistent position and the apparent change in zero POI is due to shooter inconsistency (exacerbated by heavier recoiling rifles), OR
A combination of the above.
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