My vote is to load a 168 Barnes TTSX in your 300 win mag. No question, will get it done. if you are like most of us, you will shoot the 300 better than the 338 and shot placement is key. The mountain zebra has a nice triangle on its shoulder - put one there and its in the salt.

2Pipe:

Been going to NW Namibia highlands/mountains around Kamanjab a couple of times a year for the past 10-years. Wife and I have taken several trophy MZ and a few dozen culls two years ago due to the prolonged drought. Also been with clients who've taken a few too. Calibers used have been from 308 Win to 375 Ruger and H&H. Can happily give you a couple of place recommendations - Sebra Huntswith Jan du Plessis and Shona Hunting Adventureswith Johann Weildsman. Neighboring properties in the same area. Difference is with Sebra, you'll be the only client "in camp" on the property - approximately 50K US acres and at Shona, you'll be sharing "the camp" with other clients.

NW Namibian highlands/mountain area is nearly all low-fence. Yes, there are some high fence farms also, but the elephants give them hell several times a year.

The mountain hunting can be as challenging as you want/can handle. The deeper into the mountains the better the game numbers. Later in the season, July-Sept the better as earlier in the season there is still water up in the mountains and the zebra are less prevalent in the valleys and bore hole water points. The area is roughly 3500ft in elevation and the humidity during the normal hunting season will be under 5%. If you want to shoot long distances (300yds+) you can but, there is enough natural cover that you can also stalk to under 50yrs too.

Calibers - The "new" mono-metal bullets (TSX/GMX etc) have really changed the game. A 308 with 150gr TSX takes zebra with shoulder shots out to 200yds. Wife and I have done it multiple times as well as I've seen clients do it. The 150gr TTSX and GMX are maybe second choice only because the polymer tips make them expand a little faster and not drive as deep. As mentioned above, the MZ has a very nice natural "aim point" on their shoulders - an inverted chevron with the point directly over the heart. Anything above a 7mm with a TSX on that point and you've got your zebra. The important thing to think about in this area is do you want to be a "shooter" or a "hunter".

Some things to think about before you get there - how are you planning on having the taxidermy done? Rug or shoulder mount. This will have some determination on if you want a stallion or mare. Stallions tend to have more scarring on their necks/rumps due to the fighting. Mares tend to have the "cleaner" hides. One more possibility is what is called a "Queen Mare". These are mares that become the dominant member of a herd that lacks a resident stallion for a prolonged period of time. They develop bigger bodies than a normal herd mare and also a dewlap, though not as prominent as an old stallion but, still VERY visible.

There are some high fence properties in Namibia that offer MZ but, not in a highland/mountain setting. We spent a week or so culling on one of these properties two years ago. A high percentage of these animals had deformed hoofs from the lack of rock that kept them worn down. Some were to the point they could barely walk.

Wherever you go in Namibia, it will be a good time and like most, you'll be planning a return trip before you finish this one.