What is the best way to transport black powder on an airplane?
By far the best way to transport black powder or substitute products AND CAPS to Africa or on airplanes anywhere, is to buy a supply of common larger capacity cartridge cases, fill them with BP, load a light weight bullet, pack them legally, then unload them at the hunting site using an impact bullet puller, which you carry with your gear, and use the BP as usual. I have been doing this for years and have never had a problem or questions raised. The metallic cartridge always solved the problem even when the only gun carried was a muzzleloader, sometimes not even in the same apparent caliber. I use 50-140 cases, which hold 140 grains of BP with a short 450 grain bullet. I drilled out the bullet bases, so the cartridge would hold more powder and weigh less. The brass cost better than a dollar apiece, but over many trips the cost is minimal, especially compared to airfare and hunting fees. 50-140 bullets are commonly available, or you can cast your own, and a set of RCBS dies is less than $100 which is still cheap, comparatively. THIS IS IMPORTANT: PACK YOUR CAPS IN ANOTHER EMPTY CASE, MARK IT SO YOU KNOW WHICH IT IS. Besides, if wanted, take a 50-140 hunting, it’s an amazingly effective caliber, especially with 600 plus grain bullets. I sometimes take one for back-up and for the fun of shooting up the excess powder. Bringing the empty cases back has never been a problem either.. If you will be using a large caliber anyway, in addition to the muzzleloader, then just load extra cases with BP, just be sure to mark them to avoid confusion. I did this once when taking along a 450 Ackley Magnum bolt action rifle.