100% a slippery scope here.
The difference between 300 Norma and 300 PRC/300 WM is only a few hundred FPS, in 95% of circumstances the three cartridges would be used interchangably.
If this is based on certain guns being to big (physically) and snipery it takes very little to expand a ban into cartridges that are ballistically similar to these larger cartridges.
If you look at the cartridges that are popular for short range ELR in the USA (1mile ish) we are talking: 300Norma, 300PRC, 7SAUM, 6.5PRC and other similar cartridges.
Saw this meme on a US forum the other day, obviously not the same circumstance as AU/NZ but seems very relatable.
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