Re: Long range build
Yes, you could more easily make a 300 win mag out of your 30-06. The bolt face has to be opened up. No feed rail work would be necessary. It would probably feed just fine.
As for more elevation. Start with a higher point of impact at 100 yds. Replace the 20 MOA with a 30 MOA or even a 40 MOA picatinny rail.