Now we're getting to some important numbers by multiplying 222.5 by the muzzle velocity, which gets us 489,500. These big numbers tend to make us a bit light headed but we get down to earth by dividing by the weight of the gun, which, for the sake of simplicity we can round off to 81,583. Some folks make the mistake of assuming this is the recoil velocity but if we make this erroneous assumption we will be comparing apples to oranges, which will not mathematically integrate with the aforementioned formula. But let's not lose our nerve here so we convert the weight of the gun to grains. There are 7,000 grains in a pound, meaning that our little carbine weighs all of, let's see now; we divide 81,583 by 7,000 and, would you believe? We have an honest to goodness recoil velocity of 11.6547, or thereabouts. So now we're back to the using the simple formula to get recoil energy.