I think that the expectation of a 7 lb. .308 semi-auto rifle offering adequate reliability and accuracy for your stated purposes is unrealistic.
A good case can be made for a bolt rifle which will reload using strippers, having a detachable box magazine, sturdy iron sights, and the ability to mount optics on a quick-detachable rail mount.
I had built 20-some years ago a bolt rifle resembling a sporter-weight M40, with clip-shot, McMillan stock, M14 front sight installed on 20 inch barrel, contour similar to '03 Springfield, peep sight similar to an XS machined into its rear scope base. It weighs 7-3/4 lbs. with 6x42mm Zeiss Diatal-C scope, which can be installed or removed quickly without loss of zero. Iron sights have solid 300 meter zero, as does the scope. Vertical crosshair has range tics for 100 through 500 meters. Range card with wind diagrams is laminated to butt. Solid moa grouper over repeated strings with M118LR or good handloads. Does NOT a detachable mag, as I have had no need for one. With iron sights and reloading with strippers I have no problem firing 10-shot strings prone or sitting rapid in service rifle time. Rifle is accurate and handy. Have seen nothing since I would trade it for. Alot of miles and many trips with that rifle which has served well.