RE: Which Gun
I would go with the Remington Model 710 270 WIN if you are looking for a rifle. This gun is relitively light and is very accurate. It also good for a wide range of big game such as whitetail deer, mule deer, pronghorn, and elk.
If you are looking for a shotgun, I would go with a Remington 870 Express 12 gauge. These are very good shotguns and work for any type of upland game and waterfowl.