Bramble,

I'm no expert on Zim but wouldn't recommend driving any further than you ever have to there...... but I'm sure that SAA won't stop carrying ammo to Zim. All one has to do is make sure that the ammo is in a container or containers that keep every round separate from every other round and then put it into a separate lockable box. I've done that for years anyway and the box I use is one of those aluminum camera boxes with padding on the inside and lockable over centre latches on the outside.

The other piece of advice I'd offer is if you're travelling through the UK or any other EU state, to have two separate sets of tickets. One set to take you to and from RSA (or wherever) and another set to take you from there to Zim.