It’s a good thing that Paddock was not very smart.
A small caliber shooting a tracer will not penetrate the double walled steel tank.
If he were shooting high caliber armor piercing and then tracers it could have been a problem.
I’ve heard several investigators refer to him as a high I.Q. perp. He was smart enough to amass a fortune and was also a former employee of Lockheed-Martin working on equipment for NASA,