Torque specs are designed to prevent exceeding the elastic limit of the material the threaded fasteners are made of.
So, the elastic limit of the steel in Tikka screws/actions is significantly less than the elastic limit of steel in other brands?
Don't know. It depends, primarily, on the coefficient of elasticity of the particular alloy used and the cross-sectional area of the fasteners. They seem well enough engineered that there must be a certain rhyme and reason for the specifications given. Usually (not always) a good idea to not second guess the people who engineered something. I guess, in this case, the first question I'd ask is "Have we experienced any problems torqueing the screws to factory specs?"
