Doing a build from 30-06 to 308 doesn't seem especially logical to me. I know that it has been done successfully but I wouldn't want to tackle it on my own.
I have been shooting and reloading centerfire since 1975, including 300WBY, 340WBY, 300 WM, 7mag, 7.7Jap, 30-30, 223, 6.5x55, 6.5x284, 44mag-spl, 357mag-38spl, 9mm and 45ACP.
I know I was pretty hung up on some very high powered riflery for a long time. Some of us are fascinated by titanic muzzle energy, and hot cars and boats. I just can't see having room for better performance and not using it. Saying that I have just about retired my Weatherby rifles, and shoot the 6.5x284 for recreation.
The 284 and 30-06 families have about the same case capacity, only 6.5x284 will fit in a 308 length action.
I guess that I have been spoiled by flat shooting, hard hitting chamberings. I would in your situation, go with the 280 REM. Same family, better ballistics than 30-06, not to mention the 308, and no mag length issues.
Also, I consider it a myth that short actions like the 308 are more accurate than 30-06 or longer length actions. Do you know of any long range target cartridges based on 308WIN? I don't know of any. Most seem to be based on 300WBY, and 338 Lapua wildcats, according to Accurateshooter.com, and other articles that I have read. These are heavy barreled custom actions used in 1000yd+ competitions.
It just seems to me that you're going backwards, the hard way.