IMO seems like the hunters that have responded with useful info are divided yet agree at teh same time: if you go with your 7X30 Waters and a premium bullet, make your guide aware that you want a 100 yard shot max and stick to your guns, you are paying him he works for you; but if you are ok to go with longer ranges and can afford to buy a bigger gun, then go that route and practice a lot. I would agree, esp. if your future points to bigger game.

In that case go with a 30-06 with a good brake as SSk or Magnaport and never look back..