For Zero-out we have a term and definition in Spy.

The range at which a weapon's sights will produce a bull's eye hit. Handgun fixed sights are usually zeroed-out at 25 yards. A sniper rifle scope is usually zeroed-out at 100 yards. The term cold barrel zero refers to the calibration of a SWAT sniper rifle so that the first (cold) shot will hit a target at 100 yards. Subsequent rounds will diverge due to barrel heating.
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