Save your money. The 300 Weatherby in an Accumark does not generate heavy recoil. That said, I believe the Accubrakes have a place at some point and are indeed loud, but in my experience all magnum rifles are loud.
As for damaging one's hearing while wearing hearing protection I have my doubts but would think that would also depend upon the quality of the hearing protection.
I find the Decellerator pad supplied by B&C on the Accumark stock to be excellent.
Good luck with your new rifle!