Mythbusters did the stupid bullet spinning on ice one, they have to do this.
I have no doubt it is really that easy as long as you are firing tracers in the sand.
I want to see the mythbusters try and do it with regular FMJ bullets and wonder why it doesn't work... because tracers I believe are illegal in Komifornia, they won't be able to test tracer rounds and have to just call it plausible or not be able to do it at all.
I say lets all remove the warning labels and let nature take its course.
They go to other places to test myths.
"There are no finger prints under water."