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>>Muzzle velocity squared, multiplied by the weight of the pellet, divided by 450240
Spot on. Looks a bit weird but it's because of the units used - grains, pounds, and feet.
The kinetic energy of a pellet leaving the barrel is:
(pellet weight x (speed x speed)) / 2
This is nice and easy using SI units:
(Kg x (m/s x m/s)) / 2
i.e. (pellet weight in grams / 1000 x (speed in metres/second x speed in metres/second)) / 2
The result is the energy in joules.
It gets a bit messy in imperial because grains isn't a simple fraction of a pound. But the figure of 450240 is a simple way to convert grains to pounds and also apply the division by 2 in the formula. So, you put in feet/second and grains and out pops the energy in lb/ft.
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