The 710 is cheap and there isn't a whole lot you can do with it. If you are serious about customizing it than get rid of it and get a different rifle to start with. Savage or Remington seem to be the most popular for customizations of factory rifles. If you want to get a rifle to shoot good w/o customization then I'd look at Rem, Savage, or Tikka.
To be honest, there isn't a huge difference balistically between a 30-06 and 300 wm. If you want a smaller flater shooting factory produced round, I'd reccomend the 270, 280, 25-06, 260, 264 wm, 257 wby, 7mm RUM, 7 WSM .... the list goes on. It all depends how much power, range and barrel life. I do think that the 270 would be an excellent choice if you already have the 300 mag.
I used to re-load but now I "hand-load".
-- Well, at least I try