Quote Originally Posted by Travis299 View Post
450240 is 2 x velocity of gravity x 7000, (2 x 32.16 x 7000 = 450240)
450436.7 is 2 x velocity of gravity x 7000, (2 x 32.17405 x 7000 = 450436.7)
The constant 450240 or 450436.7 depends on which value you use for the velocity of gravity.
32.16 ft/s/s or 32.17405 ft/s/s. There are 7000 grains in one pound.
The difference does not matter which ever constant is used for the FPE calculation.
It is not a "velocity of gravity" it is the acceleration due to gravity. As I said before, the second value 32.17405 is the ft/s/s value of the internationally accepted value for the acceleration due to gravity, which is actually 9.80665 metres per second squared.