Twenty centimetres to get to seven hundred metres per second. The number of g is absurd.
A 12.0-g bullet is accelerated from rest to a speed of 700 m/s as it travels 20 cm in a gun barrel. Assuming the acceleration to be constant, how large was the accelerating force?as printed, page 52
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A hundred and twenty-five thousand times gravity. Nothing alive survives this; a bullet is a solid lump of lead and copper, and even so its base deforms.
The weight of a small car, on something lighter than a coin. That is what expanding gas behind a bullet does.
Not asked, but twenty centimetres at an average of 350 m/s is 0.57 thousandths of a second. The bang is the gas, not the bullet.
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