I see no reason to go with a 1 in 9" twist barrel on a 250 Savage rifle, especially if you intend on shooting bullets 100 grains and less.
Any reason not to?
I have no idea why shooters are scared of a faster twist barrel. Makers are beginning to introduce some heavier bullets in 257 caliber. Why limit yourself to not shooting them if you decide to do so? With a faster twist, you have the ability to shoot heavier bullets while still being able to shoot everything else same as you can with a 1-10". It's almost as if they've been brainwashed into believing that a 1-9" won't shoot lighter bullets as accurately as a 1-10". Makes no difference until you get into the heavier bullets....and that's where the faster twist has an advantage.
