Well, Black Bears aren't as big as Grizz so the .44 Magnum really isn't necessary. They are, however, bigger than people so the .357 Sig is a bit light. This leaves either a .357 Magnum or 10mm which would both be about equal in performance on Black Bear. However, there is no snake shot available in 10mm and even if there was, it probably wouldn't feed reliably in a semi-automatic. For this reason, a .357 Magnum loaded with 158grn or heavier JSP, FMJ, or Hardcast would be my choice.
Smith, and Wesson, and Me. -H. Callahan
Well waddaya know, one buwwet weft! -E. Fudd
All bad precedents begin as justifiable measures. -J. Caesar