Bill - with a hand held calculator, you can easily compute FPE for any load you wish.
: bullet velocity X bullet velocity X bullet weight(in grains) DIVIDED by 450240 = FPE Note the bullet diameter does not enter into this formula & that the formula greatly magnifies value given to velocity. By this formula, the .22-250 with 55gr. bullet at factory velocity of 3,650fps produces almost 200 fpe more than the .45/70 black powder load used in the 1870's. That .45/70 black powder/lead bullet was one of the preferred buffalo ctgs. for shooting those massive critters out to 300 and even 400 yards. Something is wrong with the math - it just doesn't add up.
: Anyway, there's the formula and sometimes it is fun to see what the numbers are. 450240 is a constant and converts weight in grains x vel squared to foot pounds of energy.