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I think the problem there is the case head is also the primer so the bit that's supposed to take the most pressure has to be uniformly soft enough to be crimped by the firing pin anywhere on the rim....

They do seem to be a bit of a polarizing bit of kit it's either yes or no. I looked at one but didn't like the weight or grip.

https://nzguns.co.nz/guns/searching-for-a-replacement-small-pest-control-rifle-part-two/

Don't think I can, it's by subscription I carried my printed one over last year. It says save for offline viewing so I might try that....

There is a review of it and two other 22 mags that 55 six sell on the guns and hunting magazine website that's quite interesting.