RE: Ammo
Maybe it's just me, but I tend to play in sniper mode most of the time. I rarely do a burst, since it costs an extra action point and often doesn't do as much damage as an aimed shot. I reserve burst mode for close encounters, and then I usually use a shotgun. Unfortunately, I'm running a little low on shotgun ammo - probably down to about 400 rounds for my whole party. With the 7.62 ammo (especially with the super mutants), I think I'm carrying about 600 rounds for each character, plus about 5000 in my APC, and I sold another 5000 or more rounds to the quarter master (for about 1000 cash - cheap bastard!)
Anyway, you would have to be seriously wasteful to run out of 7.62 ammo. Try sniping at some people instead of getting close and using burst mode. The hunting rifles are good until you find some M1s or Sniper rifles. Incidentally, the quartermaster also has thousands of rounds of many types of ammo that I'm no longer using, like 9mm, fusion cells (from mission 3), 30.06, etc. While it might not be the most realistic interpretation, I'm finding that the 7.62 weapons are doing much better than anything else I've encountered.