Comparing males to females in most mammals (including us), there's certainly some truth to that, especially with large, mature males. Testosterone is some magical stuff...The verbiage I get is a mature bull has a much more robust structure. Bones are significantly bigger and musculature is significantly more dense, therefore a hunter need more power.
I don’t buy it.
P
That, however, doesn't generally translate to "bullet x will work on females, but not big males". That's never been my personal experience, ever.