No problem. And I know what you mean trying to simplify things down a bit too.
Your right though, the 243 would be a great cartridge to introduce him to hunting. Some don't like it cause it's small and they think they are under gunned. Me and my father use a 243, and many deer have fell to it. Accurate, flat shooting, and a very good bullet selection too. Pick up a 243 and grab some cheap Federal Power Shocks or Fusions, mine love them both.
Good hunting to you and your boy.