Marlin 30/30, lever action - Handles anything I am planning on shooting at, plus, ammo anywhere. It's killed everything I have ever shot it at. 'Course, I hunt in swamps and there is no shot longer than about 60 yards. I've had this gun since I was 14 and I am 39 now.
If I could go out and buy one tomorrow, I'd have a Browning 12 ga. However, I still have the Steven's 20 ga. pump I got when I was 9. It is light weight and throws a great pattern. Cannot complain one bit with it. I shoot left handed, so pumps and lever actions work well for me.
I would choose the Ruger Mark II 270 because thats the gun I have used for about 17 seasons. I have killed a stack of deer with it and would not hesitate to take a 400 yd shot. My personal longest is 433 yds (took a few shots though). Along with a 140 grain accubond bullet you can't go wrong.
As for the shotgun I have used a Browning Pump for about 12 years and before that a Mossberg 12 ga. The BPS is OK but I may go to a Franchi 12ga auto. It's basically a Benelli without the price tag.