I shoot a standard 6.5x47L with a 28" barrel + brake. I only shoot the Berger 130's @ 3010fps.
My brother shoots an 'improved' version of the 6.5x47L with the Berger 140's @ 2850fps using a 28" barrel.
I could be wrong but if you want 2850fps with no high pressures you will need a tube...