That's your AR10...building one can get you to 6.5-8 depending on your parts. Sure it'll be expensive but the OP did not dictate price as an issue at first and stated he wants a rifle for fast second shots in timber...an AR10 Carbine covers that pretty damn well. Just stating facts as "weight savings" a flawed reasoning.My AR-10 weighs just shy of 11 lbs. without any accessories. DPMS LR.308 with a 20" barrel. Any of the rifles the OP listed are no doubt lighter than that.
I had an old 180 Series Mini-14 forever but I hardly ever shot it because it was like a 3-4 MOA rifle no matter what ammo I tried. A few years back, on a whim, I removed the front sight and put one of those Limbsaver X-Ring rubber baffles on the barrel. Could not believe the difference. Turned the old pig into a MOA shooter with good ammo.The new ones are pretty accurate. There are a few tweaks that make the old and new ones shoot pretty good. I really like mine.