Leave your tape measure at home, take your rifle instead and go and have an unforgettable experience.
If it's your first hunt, just go and enjoy what Africa gives you, take what comes along and forget about trying to achieve a measurement.
You will ruin your experience if you are too involved with trying to take a certain measurement of animal.
If you don't find it you will put pressure on yourself, your PH and will come away with a sense of disappointment when instead your should be loving every minute.
What's better?
Hunting a 50" kudu that you spent hours tracking and stalking in the wild places, zebra that nearly blew the stalk, waiting in the shadows afraid to move in case he spots you, watching him go out of sight and agonising if he will reappear, the dust and the heat and the sweat, the memories of that hunt that will always live with you?
Or driving into an enclosure and just shooting a 60" bull because the outfitter knows it's there just for bragging rights and for a head on the wall that will ultimately leave you feeling cold because as a hunter you know it wasn't the right way?
A 45" buffalo will look very impressive but what if that animal is a prime breeder, you shot it just because it had the biggest horns and deprived the herd of his genes?
How about a gnarly old warrior buffalo? The beast that has survived and has the scars to prove it? The old boy who has seen off lion, leopard, humans, has a bald, scarred face, worn down horns that barely go over 35 inches but are smooth and polished, the bull with attitude and cunning that you hunted and got the better of?
Wouldn't the second buffalo be the more worthy trophy to put on your wall and admire? Tell visiting friends about the life he led and what a symbol of Africa he is?
Go hunting, don't go shooting.