If you're doing anything other than a range toy I'd go with the socom.
Just curious, but what would you be doing that wouldn't fit under the heading of "range toy"? (I include match shooting as "range shooting" and also informal plinking)
When talking combat shooting, actual use will be with what ever you are issued, not what you pick (other than in very rare situations). Combat training is, to me, still a range use.
Hunting? Deer/big game? why bother with any short barrel semi auto .308?
I don't see the point to packing around an extra heavy .308 for hunting. OR losing velocity with a short barrel when I don't get a corresponding benefit in lighter weight.
But, that's just me. I'm well past the point in my life where climbing in and out of APCs or helocopters armed with a rifle is a factor in my life.