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Where these typically used by all the troops? Armors to deem a weapon service ready? Other?
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To answer the question. It's to zero the rifle/get you on paper before you shoot at real ranges
Where these typically used by all the troops? Armors to deem a weapon service ready? Other?
In the military, before a Soldier (or Sailor, Marine, Airman, Coast Guardsman) fires his rifle for qualification, he zeroes it.
This is done on a 25-meter (1000-inch range) - and supposedly after a refresher in basic rifle marksmanship.
Using a specific target, the shooter fires groups of three rounds, concentrating on sight alignment, breathing, trigger squeeze, etc. When these groups are consistent, he then adjusts the sights of the weapon until the point of impact matches the point of aim and then verifies his 'zero' with a final group.
Machine gunners also conduct a table of fire on a 25-meter (1000-inch range) to validate their understanding the sights and of the traverse and elevation mechanism on the tripod and their understanding of how to engage targets before moving on to field fire.
This is easier that walking 250 meter or whatever down range to check targets.
25-meters or 1000-inches is also the standard small bore (.22) rifle range. Up through the 1970s many Army posts had indoor small bore ranges for rifle training (a practice started in the 1890s with the gallery model .22 Krag conversions, then the Model of 1922 Springfield, and then the commercial small bore trainers, then the M261 .22 conversion kit for the M16).