Walmart's guns are not inferior.
If you buy a Remington 700 ADL with synthetic stock at Walmart then buy the same gun at a mom and pop shop then they will be identical.
If you buy an ADL at Walmart then go to a mom and pop shop and see all the beautiful BDLs and wonder why your ADL doesn't look as nice then there's an obvious reason.
Many people don't understand this, you have to know what you're buying. Period.
Walmart won't rip you off (at least with guns).
I have yet to see a NEW BDL go for $400 (the price of Walmart's ADL's) or a Rem 870 Wingmaster go for $230 (price of an 870 Exp) in a brick and mortar shop.
Where do you buy your guns?
Let me know, I'd like 700 CDL but don't want to pay more than $386.88
Zaire, if I had $600 and wanted to punch paper far away I would get a heavy barreled Savage package deal. You can find them for $550 at Dick's Sporting Goods.
When you get a little better and can afford it, sell the scope that came with the gun and buy some quality glass and mounting hardware.
As far as caliber, I don't know you or your abilities, but if you're a beginner you may not want to get a magnum.
The accuracy potential of the .308 is a tiny bit better than the 30-06, but if you're only going to shoot factory ammo it won't matter that much.
If you're only planning on shooting paper then you can compensate for trajectory because you will know the distance, the velocity gains won't matter a whole lot.
The good thing about getting a Savage is you can change the barrel yourself as long as the caliber you're switching to fits in the action and the head diamters match (if not just buy another bolt).