In states with no restrictions against semi-autos, a five-round magazine would have you quite legal with the Socom. Ya got it, use it, for now. I did many a mile of walking-hunting with a 9.75-pound rifle. Hunting from a stand, or playing sneaky-snake in thick stuff, weight is not a problem. There is always time to look around for next year.
For a "just huntin'" rifle, there are a lot of good deals on used rifles at gunshows. I've never had a problem with the vast majority of used guns I've bought or traded into. And, for sure, a .308 will deal with anything you're likely to hunt in the lower 48.
You're from BATFE? Come right in! I use all your fine products!