I have a 1-7 MODEL 12, I am shooting Berger 80.5 FB bullets. I was wondering if there is an ideal freebore length for that bullet or any other given bullet? I started a search for .223 freebore spec I don't think I saw any two figures that agreed. I don't see how they can have a spec on something like the .223 due to the drastic different bullet lengths? I would think a 1-12 twist would be different from a 1-7 just because I like to seat the heavy bullets out further. I just checked my m12 and I get appor. .150 my Tikka measures .110 anyone have any idea what the spec is supposed to be? I see chamber diagrams but the printing is do small I can't read them. thanks Bob