That's correct Colorado Bow Hunter. There is a limit of two firearms per hunter that may be imported into South Africa for trophy hunting purposes and hunters cannot bring in more than one firearm per caliber. A person must be 21 years of age to import firearm(s) and ammunition into SA. It is possible for someone under the age of 21 to do a hunting safari in South Africa, however another hunter over the age limit must import a firearm for their use or they can rent/borrow one from the hunting outfitter. Should another person over the age of 21 be going along with you on this trip, he/she, as a "hunter", would be in a position of importing the 300 for your son, should he/she have the required paperwork.