When I am looking for info like you are asking for I go to Midway and look at Berger bullet specs for twist. The 130s are 1-9 and the 140s are 1-8. Speed makes a difference of course but 140 is probably not the best weight for that twist.
Barrel Twist Calculator
Go to that site and play with some numbers and you will see what you are up against.
Cartridge Loads - Hodgdon Reloading Data Center - data.hodgdon.com
Go here to kinda see what is possible with the 260 REM...
I would get the gun if is a good deal! Just shoot 130s and see how it does.
Shoot moly bullets to break it in. Use the clean after every shot for 20 and after 5 for 3 times and you should be good to go. Remember, it takes about 5 rounds to re-coat the barrel with moly after cleaning...