Hello, I am looking for a gunsmith in or near somewhat of Eugene Oregon. My project is a Remington 700 in 30-06 that I am re-barreling in 308. I already have the 700 action, I have a used PAC-NOR super match #7 straight taper with 1:10 twist rate that needs new threads in 308 cal, so I believe it would be cut to 22". I also have a H-S Precision stock. Other questions is is there any reason to stay with the original 30-06 cal instead. I like the large amounts of load data for the 308 to learn on. Question #2 is do I need to shim the mag for the 308? I know the Military uses the 308 cal on a Long Action before. This is my first custom build. I am on a budget. The barrel has 472 rounds through it.