It's not as clear as you suggest that a 5-shot 357 revolver has an advantage over a 357 Sig / 10mm auto. A 357 Sig will handle up to 180 grain bullets and who knows, maybe somebody has loaded heavier. Then, as you suggest, a 10mm will easily exceed the 357 Magnum as well, being the perfect example of an auto that can equal/exceed whatever a 5-shot 357 revolver can do. And the autos hold 2X+ the rounds that a 5-shot revolver will. Sure you can get a SA trigger on a 357 Sig or 10mm. It's called a 1911. One could run 40 S&W snake-shot rounds in their 10mm if desired (with or without changing barrels), and someone has probably made their own for 10mm. http://libertyfoxdefense.com/improvised-10mm-snakeshot-for-a-woods-gun/ The 357 Sig is an accurate round, and can shoot as well as a revolver. 357 Sig: https://www.shootingillustrated.com/articles/2019/7/19/converting-guns-to-357-sig-testing-options/ 38/357 Revolver: https://www.shootingtimes.com/editorial/review-smith-wesson-model-19-classic-revolver/358104 I love the 357 Magnum. Have several and carry it CCW. But they aren't magical. No round is. And when it comes to firepower, an auto outdoes it with ease.