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Old 11th November 2014, 10:27 AM
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RobF RobF is offline
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Default Ft-lb constant for muzzle energy

What is the muzzle energy constant used in disciplines for calculation of muzzle energy?

Reason for asking, I've come across a few different constants used in various online energy calculators.

8.4gn at 800 fps in one gives 12.00, another gives 11.90, another 11.93, another 11.94

It seems the constant is a 'fudge' to impart the acceleration due to gravity to work with weights, because imperial units use weight instead of mass... which varies across the globe, and seems to be rounded here and there.

I'm 1/2 tempted to calculate using Joules and then convert back. Just trying to make up some easy reference to competition limits based on pellet weight.
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