On Apr 9, 8:39 pm, Ashton Crusher wrote:

One of the things the article in BACKWOODS MAGAZINE points
out is that the government will be searching with the same or
better instruments than are available to the citizen, including
more sophisticated metal detectors and ground penetrating
radar, since they know that people are burying guns. If the
burial sites are marked in the way you suggest, they would be
child's play to be found.
The article points out ways to "mark" the burial site without
using these methods.

Regarding immersing the gun in oil. It would probably work.
I don't see why not. But it would be a different matter for the
ammunition since the oil would penetrate into the cartridge.
Been there, done that. Not a good idea...