This might be a fun experiment...
I could record 4 to 6 channels at 131,000 samples per second. That could be one tri-axial accelerometer at the muzzle, a single axis accelerometer at the stock or action, and one microphone at the muzzle for 5 channels. I could also perform an experimental modal to determine the natural frequencies and mode shapes of the barrel.
Processing the data might get interesting though
I've heard/read that there is some old high speed video showing what Al describes where the barrel deforms before the bullet exits the muzzle, then oscillates after. I've never seen it, but we could collect data to find out what actually happens.
