My string is 60.5 and they said to round up to the next inch so I would need a 61" string. I am at the bottom of my suggested brace height at just a touch over 7.5. suggested brace height is between 7.5 and 8.5. I am going to try a fast flight flemish twist string.
Montanas are 64" long, most longbows need a string 3" shorter...61". I use FF on both of my Montanas with good results.