Technology has improved the 22 WMR for defensive use. Hornady makes a Critical Defense round in 22 WMR.
Rock Island calls it the XT22.Are you thinking of 22 TCM? Different animal but potent none the less.
Like you, I've never owned one but have witnessed the KelTec pistol at the local range. He dumped 2 magazines into the berm. Afterwards we discussed it, as an owner, he thought it was fun and worth the money but overpriced. It is ammunition particular for smooth operation.The PM30 Kel Tec has its detractors. Some call it a jammamatic. That's just rumor far as I'm concerned, but if I really wanted one, I'd research it first. I've got the Black Widow because it fills a niche for me. If I could carry a PM30, I can carry my PT145, my 605 Poly, or my Kel Tec P11 9mm....or my Ruger P85 or P90 for that matter. But, for folks with an arthritis problem, it could be the answer. It certainly doesn't lack firepower, 30 rounds per mag.
Don't forgot that a 454 Casull is so powerful that it will sever that wing causing near instant exsanguination. Back in reality, the placement is key if it reaches the organs. Which is why the 5.7 and 380 are good carry rounds, they penetrate deep enough to puncture organs without exiting the body to hit bystanders.Bingo! A vital organ hit with a .22WMR is a lot better than a wing shot with a .454 Casull. However, both would certainly hurt when they hit you.
Somehow that one got by me.Still in production or did it have problems I wonder??All I need is another 1911 to want.....Rock Island calls it the XT22.
Her comment about the 22WMR being 'rather better' was in comparison to a 5.7, not a .380. Her rationale was that the 5.7's 'pointy spitzer bullet' profile caused it to yaw and stopped penetration, while the 22WMR (not shown in the article's gelatin) had a bullet profile that allowed more efficient penetration.I get why she's trying to say: " These days I think that, given the right loads and circumstances, .22WMR can be rather better."
Certainly a longer barreled pistol chambered in 22WMR will out penetrate a micro 380. She doesn't really get into such comparisons and paints with a broad brush.