In regards to the legal side of the question above there is a newer Government Gazette issued in 2011 that refers to the bullet weight rather than the caliber. In the Eastern Cape the Ordinance is from 1974 which is also somewhat different. I know the OP is from up north, but I don't have the Ordinance for MP, just wanted to show that the rules may be somewhat unclear. There may have been later issued Gazettes and Ordinances, but I haven't seen them. Of course these are for open land and not under fence (CAE) where the rules are somewhat different again.