I have had 3 weatherbys. Both the mark 5 deluxe and ultralight 257s responded well to removing the pressure point and bedding the action. The ultralight never really shot better than an inch. A simms slip on vibration damper shaved a quarter inch off that! My 257 accumark has been bedded as well and has produced the best groups I have ever shot. The 300 ultralight is known to be the least accurate weatherby rifle so don't expect too much from it. I would try that barrel damper though for sure.
