Alright sounds like it's my ammo going supersonic. Thanks for the advice.
To answer the questions:
This is the rifle https://www.nzhuntingandshooting.co....z-452-a-98019/
I've been using the little boxes of cci subs that I got with the rifle, I haven't tried any other stuff yet.
I have not parked up and shot a whole bunch of rounds, but I haven't noticed any rounds being quieter than others, so I think they're all going supersonic.
I've bought a new box of ammo. Will try that.
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