TexasCHLforum.com

A couple of things:

1) The circumstances of a shooting (who, what, when, where, why?) are several orders of magnitude more relevant than whether an actor loaded his .357-capable wheelgun with .38 rounds because he thought it was more humane/compassionate/whatever to use those versus the full-power cartridges.

2) If someone feels threatened enough to break out the 12ga or a magnum revolver (ie, to use deadly force), he or she is best served loading the weapon with the most powerful cartridge he or she can control in said weapon, to stop a threat using the minimum number of cartridges.

In brief, I would consider what you heard to be very bad advice.