Get the 1:10! The 1:14 is aggrivating to say the least. It works with up to 75gr. bullets (like the .256 was designed with) but really limits what you can use. It doesn't work very well at all with the 89gr. 25-20 cast bullets. If you want to shoot cast, make sure your barrel is throated for the bullet you want to use, seated to the base of the neck.