If you have not read it, a must read doc of extensive formal third party testing of common duty loads, and 5.7. If you don't want to read all the details, caliber summary starts on page 35.
*It appears solid copper is the way to go. I may switch after reading that report.
*Rnds with excess velocity like the 10mm have higher failure rates, and as expected, unlikely to be the best choice
*.45 still appears to be hard to beat. Whether the juice worth the squeeze in reduced capacity, recoil, etc is the Q
* 5.7 (first formal testing I'm aware of for SD handgun) did exhibit some impressive results and very bullet choice dependent and may be a viable choice under some circumstances.
https://drive.google.com/file/d/1Z6g...h8dK2rHqo/view
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