Air shooters often require calculators. If the weight and flight speed of a projectile are known then it is possible
to calculate the muzzle energy in foot / pounds (or Joules if you prefer metric). Users might wish to determine one
value based on another - so for example figure out the highest grain weight of a projectile that can be used for a
particular speed and muzzle energy. Other calculators allow you to determine (both ways) flight time and/or distance
assuming you know the speed of of the projectile - which can be useful if you need to know the time it will take a
projectile to cross a fixed gap.
The calculators default to employing imperial values (foot pounds, feet per second (f/s) or inches when it comes to
fixed distances) but there is an option to switch to metric (joules, metres per second (m/s) and mm for fixed distances).
It is worth highlighting that projectile weight is always measured in grains (so, use the grains/grams conversion if you
only know the weight of your projectile in grams).
Different countries have different legal limits or restrictions on air guns - so make sure you find out what
applies in your jurisdiction... wherever that may be.
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