For an idea of how much more powerful a 7.62mm NATO round is over a 5.56mm round, just watch this video...
http://www.youtube.com/watch?v=rOm3dfYYNeI
If ever the need arises, the boy and I have the same opinion...."pass me that Saiga 308, please!"
It looks mean and it acts mean, especially with a 20 / 25 rnd magazine.
I may have to get another one.