Re: 30.06 vs 300WSM
To answer your barrel life question... The only magnums that have problems with barrel life are those we deem as being "over bore". Lots of case volume relative to a smaller diameter bullet.
The .264wm, the 300 Rum, the 7mm STW are considered by a lot of folks to be "barrel burners" because if you shoot high volume in them heating them up, continuing to shoot, you will burn out the throat in as little as 500 rounds.
The .300wm, 338wm are good examples of magnums that really don't have the same problem unless again you really push them with high volume, hot barrel shooting, and they will still last longer than the above.
As for the 06, I'm not really sure a guy could stand to shoot one enough to burn it out.
I've seen some 03 Springfields and M1 Garands with literally thousands of rounds down the tubes that still shoot bug holes at ridiculous ranges.
As for rifle choices if you could find a CDL model Remington you'd really have a nice rig you could count on forever with an endless array of aftermarket upgrades.
Like the above poster if I were going with the browning I'd go for the A bolt.
Without the First and Second Amendments the rest of The Constitution is Meaningless.