ME calculation

[Pipe Smoker]

I've just spent some time figuring out how to calculate ME, in ft-lbs, given MV, in fps, and bullet weight, in grains. Here's the equation, accurate to 3 decimal places:

ME = MV^2 * weight * 2.22e-6

[Bill Steele]

I usually just go here: http://billstclair.com/energy.html

[Deimos887]

I have memorized:

Weight x MV^2 / 450390 = ME in ft/lbs

easy to remember and it seems to work.

comparing the two yours comes out to:
test variables = 125gr @ 1350fps (.357sig)

ME = 505.743 ft/lbs

mine (same variables):

ME = 505.811 ft/lbs

[rsrocket1]

2.22e-6 makes for a very simple factor to memorize since we always think in terms of grains and fps. A little easier to memorize than to divide by 450390 (which is the same thing)

Thank you Pipe Smoker.