If there was a way to accurately measure "stopping power", sure the more powerful round will win the comparison. However, with that extra power comes extra penetration of interior (and exterior) building walls, excess recoil which you yourself said compromises your follow-up shots and deafening (literally) report in enclosed spaces. Street studies of effectiveness vs caliber exist and are frequently cited. I have not consulted those, you may wish to but my "357 compatible" J frames are loaded with +P, not the magnum round. Best of luck. Ed

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Ed45