I personally don't own a weatherby, but I was helping a buddy with his rifle before our moose hunt this year with his. He showed up to the range with his 300 WM Weatherby Vanguard Weathermark and pulled out of the case from which he had left it in after last years moose hunt. Rusted and corroded everywhere and I assume inside the barrel is not much better. Start talking to him about gun care yada yada yada... might as well shoot it while we're here. Pulls out a box of Precision Hunter 200 gr ELD X.... .75" group at 100 yds. Proceed to tell him to wait and clean the bore until after our moose hunt hahah!