the perfect firearm for me will most likely never be built... saddly
My perfect gun is a Winchester 1892 levergun with peep sights chambered in the extremely versatile 45 Long Colt. You can load that cartridge anywhere from very light plinking loads to nearly as powerful as the mighty 454 Casull. That's enough punch to take down anything on this continent inside of 150 yards. And the levergun is like a bolt gun in that the action won't care what recoil force the cartridge puts on the bolt.
Around here where you rarely see shots over 100 yards in the woods, the levergun is perfect. You stalk or wait with a round in the chamber and the hammer on half-cock. When you sight your animal, you click the hammer back to full cock, and you're ready to rock. Nearly silent. Then you deliver a bullet that, if loaded right, delivers more energy than a 30-30, and does more tissue damage.
And for home defense? Hard to beat.