The RWS SUBSONIC HP is a special cartridge for low-noise shooting. The bullet velocity stays distinctly below the sound barrier – consequently there is no sonic boom. It offers similar good shooting performance as a standard cartridge, but with significantly less noise. Due to the hollow tip, this ammunition achieves a sure and reliable effectiveness with small game and varmints.
All mail order sales of ammunition to the public require a NZ Police permit.
https://www.firearmssafetyauthority.govt.nz/sites/default/files/2024-09/Mail%20Order%20or%20Internet%20Sales%20of%20Arms%20Items%20or%20Ammunition%20-%20FRM43A.pdf