200m zero versus 300m zero.
A 200m zero is better for closer engagements. Flatter, allowing for less adjustment for 200 meters and closer. Still allows for a simple adjustment of 10-12 inches adjustment for targets at 300 meters.
300m zero is flatter overall for further distances but calls for making adjustments at intermediate distances.
Bottom line, if you need faster shooting at closer distances… just use a 200m zero.
This works best when applied to iron sights that aren’t adjusted very often or for red dot/ reflex sights.