I would vote for the 44 magnum with a longer barrel for the 100 yard criteria that you mentioned.

The 44 mag has stood the test of time. BTW I have a really nice 57 6" that I bought 25 years ago. Great gun and I do reload for it. I have taken a few white tail deer with it. I have a 629-1 4" that I shoot infrequently. Also reload for it. Pretty brutal for a lot of shooting in one day.

I have also been thinking of adding a 460 or a 500 to my arsenal. Which one is going to be a "41 mag" of the future? I am getting old and trying to figure out which one would be the best resale value. If I was a young whipper snapper I think I would place my bet on the 500. Just my 2 cents.