Even 1.5 revolutions at 240,000 RPM would, as Bob pointed out, squeeze your brain out through your ears
Bob,
It's not that the bullet spins faster as it penetrates, but that the spinning continues as the forward motion slows down. Similar to the propeller on a boat. Picture the 'wound channel' in the water if a boat sat stationary with the propeller spinning. As the boat accelerates, the propeller starts out by spinning hundreds of times in the same place, to spinning 1 revolution every 1 foot of movement of the boat, and finally at top speed the boat travels 10 feet for every revolution of the prop. The wound channel in media would be a similar idea, only in reverse. The boat begins at top speed, and slowly comes to a stop while the propeller keeps spinning.
