Health and Safety reasons, for one.
charge
you messure
Butt to muzzle
mass
Messure it,
You messure from your waist, high is just below the end of ribs low is juat above your waist.
Well you cant really, they are totaly different things. Centimeters messure length and kilograms messure weight
to measure distances
same as 1 cup
In Fahrenheit (F) or Celsius (C)
you have to messure your chode
at sea level to messure air.