During the song there's a lot of palm mute that I haven't tabbed.
You can hear it easily.
Song: For Whom The Bell Tolls
Band: MetallicA
Album: Ride the Lightning
Transcribed by Keegan Witwer

Normal Tune
------------------------------ Bass Tab -------------------------------
beat 120

Intro:
4/4                              
:--------------------------------|--------------------------------|
:--------------------------------|--------------------------------|
:--------------------------------|--------------------------------|
:--------------------------------|-----------------2-2-----2-2----|

There are two basses, the first plays the higher note and starting E.
The second plays ending F#.

With distortion and wah wah
|--------19-18-17-16-------19p16-|--------19----------------------|
|*-------------------------------|17--16-------------------------*|x 8
|*-------------------------------|------------17--16--------(16)\*|
|-0------------------------------|(0)--------------2--2----2--2---|

Normal Bass
|--------------------------------|--------------------------------|
|*-------------------------------|--------------------------------|
|*-------------------------------|-----------------------------0--|
|-0---3---2---1---0---3---2---1--|-0---3---2---1---0---2---3------|

|--------------------------------|--------------------------------|
|--------------------------------|-------------------------------*|x 4
|--------------------------------|-----------------------------2-*|
|-0---3---2---1---0---3---2---1--|-0---3---2---1---0---2---3------|

|--------------------------------|--------------------------------|
|--------------------------------|--------------------------------|
|--------------------------------|--------------------------------|
|-0------------------------------|(0)-----------------------------|

|Fig.1
|--------------------------------|--------------------------------|
|*----------tripl-----------tripl|-----------tripl-----------tripl|
|*>------------------------------|--------------------------------|
|-0---------0-0-0-0---------0-0-0|-0---------0-0-0-0---------0-0-0|

|--------------------------------|--------------------------------|
|-----------tripl-----------tripl|--------------------------------|
|->------------------------------|->------------------------------|
|-3---------3-3-3-3---------3-3-3|-3-------------------------12\--|

|--------------------------------|--------------------------------|
|-----------tripl-----------tripl|-----------tripl-----------tripl|
|->------------------------------|--------------------------------|
|-0---------0-0-0-0---------0-0-0|-0---------0-0-0-0---------0-0-0|

                                  1.                           (1)
|--------------------------------|-tripl-----------tripl----------|
|-----------tripl-----------tripl|------->--------------->-------*|
|->------------------------------|-3-3-3-3---------0-0-0-0-------*|
|-3---------3-3-3-3---------3-3-3|--------------------------------|

                                  2.                  (2) end Fig.1
                                 |---tripl-----------tripl--------|
                                 |->------------------------------|
                                 |-3-3-3-3---------0-0-0-12-\-----|
                                 |--------------------------------|

|Fig.2
|--------------------------------|--------------------------------|
|*tripl-----------tripl----------|-tripl--------------------------|
|*------>--------------->--------|------->--------->------->------|
|-0-0-0-3---------0-0-0-5--------|-0-0-0-3-------0-6-------2------|

                                                         end Fig.2|
|--------------------------------|--------------------------------|
|-tripl-----------tripl----------|-tripl--tripl------------------*|
|------->--------------->--------|-------->-------->------>----->*|
|-0-0-0-3---------0-0-0-5--------|-0-0-0--3-0-0----6------2-----1-|

Verse 1, 2:

   Repeat Fig.1

End Verse

Chorus:

   Repeat Fig.2 x 2  (To Coda at the end of second chorus)

End Chorus

Interlude (between first chorus and second verse):
:--------------------------------|--------------------------------|
:*----------tripl-----------tripl|-----------tripl-----------tripl|
:*>------------------------------|--------------------------------|
:-0---------0-0-0-0---------0-0-0|-0---------0-0-0-0---------0-0-0|

|--------------------------------|--------------------------------|
|-----------tripl----------------|-----------tripl-----------tripl|
|->------------------------------|->------------------------------|
|-0---------0-0-0-0---------/12\-|-3---------3-3-3-3---------3-3-3|

                                  1.                           (1)
|--------------------------------|-----------tripl----------------|
|-----------tripl-----------tripl|->-----------------------------*|
|->------------------------------|-2---------2-2-2-2---------/14\*|
|-0---------0-0-0-0---------0-0-0|--------------------------------|

                                  2.                           (2)
                                 |-----------tripl----------------:
                                 |->------------------------------:
                                 |-2---------2-2-2-2-----------2\-:
                                 |--------------------------------:

Coda:
|--------------------------------|--------------------------------|
|*-------------------------------|--------------------------------|
|*-------------------------------|--------------------------------|
|-0---------------2---2----------|-0---------------2---2----------|

2/4
|--------------------------------:
|-------------------------------*:
|-------------------------------*:
|-3---3--------------------------: End (fade out)