RE: What & Why
Depends on the locale:
Beretta AL390 shotgun with a hastings slug barrel. Used onlywhere slugs are legally required. Accurate enough, amazingly effective.
Marlin 1895 .45-70, when shots will be < 150 yards. I use this when hunting in very heavy cover. I want a big hole and a big blood trail. With hand-loads, this rifle is very accurate. This rifle is not blessed with a flat trajectory.
Sako .308 when shots will potentially be > 150 yards. Again, with hand-loads, a very accurate rifle.
-nosualc