Question for people shooting both semi & bolt guns

[Trikstr]

None of my charge weights/velocity are matching up with reloading data that I've been able to find. I,m usually 150-300 fps slower. I guess because of the pressure bleed off to operate the action.

[N310toN170]

You are more than likely correct...this is why many reloading manuals have separate sections for 'service rifles' and take into account powder burn rates for reliability and pressure.