There are various chemical strippers - I think Midway even markets
one designed for those pesky epoxy finishes that Remington used
for a bit on their stocks. You might try something like that on a small
area and see how it goes.
Unfortunately, I think the other boys are right on this one - you're
gonna have to mechanically strip the beast. In doing so - PLEASE
dont' skimp on the respirator! It's not such a big deal if you're only
doing a small piece or area, but you're going to inhale A LOT of that
dust without good breathing equipment. Do most of it outside, and
cover it with a tarp between sessions so the sun/rain won't make it
worse.
A million or so coats (give or take!

) of tung oil will make it beautiful
once it's sanded down to 400 grit or so.
It'll be a lot of work, but it oughta be gorgeous when it's done.
Good Luck!
-Stretch