With the numbers of cartridges available in over the counter rifles now, as compared to 40 years ago, there really isn't any reason to start someone on the 243, and I'm a firm believer in the ability of that pip squeek cartridge.
I don't have any experience with the 7-08 but I do the 7x57, and I have to question if a young/new shooter can't handle the recoil of either of those loaded with 140-150 gr bullets , with a good recoil pad and stock adjusted to fit, whether that shooter has any business shooting at live game at all.
To many times new shooters are dumped into a position of having to use a rifle that don't fit well, and then is expected to have to make shots at distances , under conditions , that the person mentoring probably doesn't have any real business pulling the trigger on.
