If you can find someone who subscribes to African Hunter magazine, there were several articles on this cartridge, the rifle, and how it performed in Africa, a couple of years ago. Not my cup of tea, but I remember the write-ups were quite positive. Could be promotional though, you would need to know who the authors were and any association with the company.

I'll have a look for the references when I get time, or someone here may have them to hand.

Meanwhile, just ring up Jeff Cooper if you want an 'unbiased' positive opinion!