ot looking to dis the .308's one bit as I have one and love it to pieces.
The thing about the 300 is that you can drop the loads down to a much more tolerable level for general shooting and practice and still have a hell of a rifle. The lower loads will also help you to keep some life in the barrel as well.
With the .308, you can only go so far and your still not in the ball park of the 300 with the heavier weight bullets.
There are pro's and Con's to both calibers, but the end result is if you are satisfied with the purchase. Either one out to 500yds will do anything you could ask of them if you do your part.
As to a great stock, as mentioned contact Joel. He will work with you and build you something to be proud of. I had fully intended on having him build one for my 25-06 AI, but instead ended up getting a go ahead for a matching HS for my Christmas present. I am still saving for the one i discussed with Joel, so if I don't like how the HS works out he will get the next call.
Good Luck and enjoy your new rifle which ever it ends up being.