This save for Red Dead Redemption was made immediately after the tutorial missions with Bonnie.
All costumes are unlocked except for the US costumes, but the US Marshal challenges are now available. You just need to get to Mexico and the shelters will become available.
All weapons and pistols are unlocked.
This save will allow you to immediately enjoy all the available items and features of the game without having to go through the initial stages.
Installation path: Documents > Rockstar Games > Red Dead Redemption > Profiles > 2E0670D3.
Just move the file called RDR2SAVE1.SAV to this folder, click "replace" if prompted.