We recently read all 4500 or so pages of Stephen King's "Dark
Tower" series. These seven novels chronicle the journey of a group
of gunslingers in a futuristic Wild West after most of humanity has
died off. This is one in an unofficial and unnumbered series of
caches dedicated to the cast of characters in these books.
Hopefully these caches will allow you to imagine the desolation of
a world that has "moved on."
You're looking for a 50-caliber ammo can hidden in what should
be a fairly obvious location. The cache is near a convergence of
roads and can be accessed from the right roads by any
high-clearance 2WD.
Good luck, and happy caching!