Calibrated weights are available in NZ.
I bought some recently to test & calibrate a digital scale.
I couldn't figure out why the website kept asking me if I was over 18.
Turned out the weights were on sale on a tobacco website - suspect other items may have being weighted too.
The accuracy you need will depend on what sort of shooting you're doing.
Hunting? Target Shooting? Bench Rest?
The nut behind the bolt and the wind will generally introduce more error.
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