Ok i am wanting a 30-378 in a remington action and gun but of course we all know that isn't offered. To top things off i am left handed also. What would i need to do to get what i want. Can i go buy a Rem 300 ultra or something like that and rebarrel it for the weatherby? Would the factory action be able to be modified for the 30-378. Thanks for your help. I am a newbie to building guns and been reloading for about a year now.