Gavin Dunne/Miracle of Sound has said the chords are spot on, so that's about as 
trustworthy as it gets!
However the tab/riff has not been confirmed and will have to be done by ear until we see
Gav himself playing it =)
Played in Standard tuning (EADGBe)

Intro/Verse
A C G D

pre chorus
F Em G

chorus
A C G D

|-----------------------------|
|-----------------------------|
|--7b8--5------------5--------|
|---------7---5-7-5-7----5h7--|
|-----------7-----------------|
|-----------------------------|

A  C   G  D  F  E
x  X   X  X  X  X
x  X   X  X  X  X
x  X   X  7  X  X
7  10  5  7  3  2
7  10  5  5  3  2
5  8   3  X  1  0

The song is done by Gavin Dunne who posts his songs on Escapist every 2 weeks, this song
was based on Rockstar's game Red Dead Redemption. The whole song was written by Gavin
who is a great musician and a real inspiration. He also writes articles for Escapist 
titled 'Encore'.
Any issues contact me at - masterwindoo117(at)hotmail(dot)com