Congratulations kman and get ready for the hunt of a lifetime. I was there a few years ago and will definately be going back. I would recommend leaving the mechanical heads at home. They would work fine on the blesbok and impala but not the kudu. Kudu are big and extremely tough. You hit bone and the 75 gr mech head may not be up to the task. There are a lot of guides in Africa that won't let you use mechanical heads, check with your guide but I would guess he will try to steer you away from them, especially if you are interested in some of the larger game like kude, gemsbok, etc.