John, I seriously doubt there is a single person working in JoBurg airport who could tell you what a bullet weight is, they don´t check the ammo, quantity or calibre so checking bullet weights !!! When I arrived at Mopoto last year and opened the gun case on the holland the guy picked up the stock and action then the barrels and told me I only had a permit for one rifle, not two !!! and he wasn´t kidding, we had to explain they fitted together (the outfitter had also got the last number of the serial number wrong so you can imagine the next two hours

but that is a story for when I meet you) best, Mike