"which uses a bullet that's six inches long...."
Damn news reporters are mostly morons. They seem to have any knowlege of anything they report on. The bullet is about 1" long. It is a half inch in diameter. The shell casing is six inches long. And it would be a un-believable lucky shot to bring down even a piper club with one round from this weapon.
Ask any soldier or Marine if I am not being truthful.
These bozos just keep rolling along in mis-information.
So a well place shot lets say from a Winchester 460 Magnum on some fuel valve at a chemical plant will probably do just as well as this 50 caliber round. Now remember anyone can walk into a gun shop and by a Winchester 460 caliber rifle.
Only thing is, with the 50 caliber rifle, it has a much longer barrel, which leads to a higher muzzle energy and a flatter bullet path, which will retain more energy at much longer distances. But this article as others, makes it sound like a 50 caliber rifle can bring down a chopper or military jet or airliner with a few shots. It is very misleading in my opinion. Of course a 50 caliber machine gun is a different story, but that is not the issue here.
You make a good point. Affixing a 20lb propane tank, rigged to explode, under one of the many gasoline tankers would be a much more likely approach to attacking an oil facility.