5% of C is 9300 miles per SECOND. What are you smoking?
I apologize, I got the C value wrong. But the idea and the function will work.
It will hit a tank, leave a very small hole because the pentrator will be small, and will exit the other side pulling most everything in the tank out with it.
An attempt was made in Iraq and the speed was slightly too small. The penetrator entered onone side, hit the armor on exit and stopped. The tank was a kill, the people inside got a little shook up, a lot shook up, but survived. The entrance hole and the exit hole were smaller than a pencil.
The technology is there, the means to put it into action is not. And we are not necessarily the ones in the lead.