No help here with a man like Phil on the job, but, were I too take my 458 for big bear it'd be loaded with either 500gr Woodleigh or Partitions, they both leave the old FN Browning Safari just North of 2150 fps, my part being done correctly, cant see where either wouldn't handily do theirs. good luck and have fun.
How about a 500 gr. Swift A-Frame? They have a good rep in other calibers, not sure about .458 Win.
DF
