in the form of sandbags, has been used by
the military for many years. There are probably
many reasons it is used, including the fact
that sand is available and cheap (free),
but it wouldn't be used unless it worked.
So, how well does it work?
I could have just shot sand bags, but sand
bags come in many forms and sizes. And,
it would matter how they were stacked, end-wise,
But the main problem would be that there
would be no way for me to accurately measure
exactly how many inches of sand had been