What I think I am going to NEED is a rifle that will hit deer hard, be easy to carry all day and handy to bring into action (quietly).
You just described a Marlin 1895 Guide Gun in either 444, 45-70, or 450. The Guide Gun has an 18.5" barrel, weighs about 7lbs, and hits like a freight train. Although it isn't as flat a shooter as your .308, it will easily reach 200yds...which is plenty for still hunting.
Carrying the guide gun is far more enjoyable than my Rem. 7600 in .35 Whelen. It points very quickly, and the balance is perfect.
Big power in a light, well balanced package. You can't go wrong with the Marlin 1895G.
