Just when I thought my latest bout of 'Clarence Darrow Syndrome' (a disease that afflicts many, is often embarassing, but almost never fatal) was over...

Well now that we have the Shuttle and flywheels and measurements of thrust from 2 or 3 grains of powder in the mixed discussion about guns, I'll toss in that I believe acceleration of a firearm in recoil is measureable...you can believe it or not. Accelerometers are common pieces of test equipment which my wife, a vibrations and accoustics test engineer, utilizes in her daily work. So plotting the acceleration curve over time is straight forward stuff.