I would go with a small bolt action rifle, maybe a cz 527 Carbine. I would pass on optics myself, i just dont see them as necessary for a survival rifle. As far as extra ammo goes, i would carry a little extra ammo,maybe 20 rounds or so. I think there are other things that you could use more in a survival kit (firestarter water, food, medical supplies, etc) so i wouldn't go crazy with ammo.