okay here is my question. i have a Marlin XS7 in 7mm-08, it has the 22" sporter type barrel in 1-9.5 twist. i want to rebarrel it with a heavier 24", fluted barrel. the options on their barrel twist rates in 7mm are 1-8, 1-9 and 1-10. which one would be the best rate for my rifle? i need an idea on rate of twist based on bullet weight of about 120gr-140gr. any help and suggestions would be appreciated. thanks.