And my problem with overkill would be?...
I like the 7.62 Nato round for any situation that may arise. While my new Sig 556 is a great answer to the AR in the 5.56mmm realm (dependable and accurate, AK meets AR), the caliber still stinks overall IMHO considering the rounds out their that have much better ballistics. I prefer my (shortened) FAL tactical. Works great in close quarters and long range too with plenty of stopping power.
Of course what do I know... I always go for overkill.
