Thanks. That is probably it. I have never used them.
I built a Tikka today with a Proof carbon Sendero 24” 6.5 PRC barrel that weights exactly 2oz more than the factory T3X Lite 300WM Stainless barreled action. If that same barrel in .30 was used it would weigh almost exactly the same.
Carbon is a huge advantage in that in the longer magnum tubes it weighs about TWO POUNDS LESS compared to the same steel barrel.