I just got a new 30-338 Mag. barrel put on my reciever, and am in the process of making up loads. I want to use shortened 300 Win. cases, so that I can run a longer neck than I get with 7 Mag or 338 Mag. cases. I made up a batch, and they chambered fine until I seated a bullet. With a bullet seated the neck is too thick the last third of it's legnth, where I guess the 300 Win. shoulder was. So my question is; Do I need to get an inside neck reamer, or an outside neck turner, or both? Any help appreciated.