I thought it appropriate to bring to your attention the ammunition limits nominated for a Restricted Goods Permit required for export of firearms and ammunition for Category A B and H firearms when accompanied by the user;

Target shooting 4000 rounds
Hunting 200 rounds
Protection in international waters against piracy 300 rounds.

Somewhere, somehow, a bureaucrat has determined that precisely 300 rounds would be sufficient to stave off a piracy attack. As a side issue, it seems that once offshore, the legitimacy of self defence use, seems to be acknowledged. Luckily, there are no pirates on land back here.