My Grandma told me that my Grandpa (both on my Mom's side of the family) killed a 300 pound black bear with a 22lr. That was the only gun he had at the time. This was when he had been home from WW1 a few years. I'm going to guess maybe mid 1920s. In the 1970s I hunted a lot with a guy that carried an M-1 Carbine. I helped carry out 2 Black Bears he shot.
I got my 1895 in 45-70 in response to our state of Tennessee letting the feds release Grizzly Bears about 100 miles from where I live. Not that far from where we go hiking and camping.
But overall I'm going to say shot placement is 99% of the final result.
ps I didn't port mine.