There is a whole lot of jargon out there that shooters use. I Sight in my rifle before shooting, and then zero in as I go. That pretty much sums it up 🙂
But here is the breakdown:
So many use the terms interchangeably, which describes the process where the Point Of Aim (POA) is adjusted to match the bullet’s Point Of Impact (POI) at a given range. This is “sighting in”, or bringing the sights to match where the bullet actually impacts.
Zeroing, then is the next step, where an adjustable scope is readjusted to show “0,0” (middle of cross hairs) for windage and elevation at your newly “sighted in” point of aim. This allows the shooter a reference point when adjusting for windage or elevation changes in the field. Not all scopes can be readjusted, so do your research before buying.
For example, if my rifle was sighted in and zero’ed on a calm day at 100 yrds, but I’m in the field on a slightly windy day, and a target shows itself at 300 yrds. Instead of “holding over” to make the shot, i.e. holding my cross hairs OFF target to account for the extra drop and for the wind, I can adjust my scope and hold the cross hairs directly on the target. Say I need to make a 4MOA adjustment for windage and 2MOA for drop, I can make the adjustment, then easily re-zero the scope following the shot to go back to what it was.
This guy really get’s detailed, for those of you that want to be an expert…there’s too much info to talk about lol. The Big Three Scope Adjustments.
I’ll leave you with simplicity: