I hear ya on light transmission but thats all we got.
I dont think I would try a rifle scope on the 308 either. Considered it on my 7mm08 but thought better against it.
I have a .300 Win Mag with brake now and use a Bushnell Elite 3200 2-6x32.
Its decent enough but lacks in last few minute as you well know. No more then any other 32mm FO scope IMO but still...
Just got to use to those mega 50mm FO scopes on the rifles. LOL
Good Luck in NH too.