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Yes, I suppose it's better to express acceleration in g's. The average acceleration in the barrel is 48,564 g's, or 48,564 times the force of gravity.
It's also possible to calculate the average force on the bullet in the barrel using the muzzle energy.
Force is equal to energy divided by the distance over which the energy is applied.
In this case the muzzle energy is about 2081ft-lbs and we know that energy was generated over a distance of 2 feet.
2081 ft-lbs / 2 ft is 1040.5 pounds force.
One can also calculate the average force on the bullet in the barrel using the muzzle momentum since average force is equal to momentum divided by the time over which the momentum change occurred
In this case the muzzle momentum is about 1.665 pound feet per second. We earlier calculated that the bullet is in the barrel for about 0.0016 seconds. 1.665 pound feet per second / 0.0016 seconds is 1040.6 pounds force.
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