I suspect they have always worked. In buffalo terms.i further suspect.they were particularly useful when breaking down said bovine. Imagine a 300 grain solid hammering you through the shoulders at 2400 fps. I suspect if.it did not put you down, the shards of bone it blew throughout your thoracic cavity would have I. Short.order. I bet someone who says they dont work has never seen them used.
I'll take that bet.
I've killed buffalo on three continents. Most in a day was 28 which I've done twice. Most without moving my feet was fourteen. Most in a week was 111. Best combined day (Three shooters) was 81.
What do I win? Never mind, you wouldn't pay up anyway.
That is meaningful experience.
What is your preferred rifle, cartridge, bullet, and shot placement?
I killed more with a hot loaded .458 Win M70 than anything else, but have used the 375, 416 Rigby, 450 NE, 300 RUM and 30-06. Used A-frames, Woodleighs, TSXs, Partitions, CEBs, Hornadys, and even a few Accubonds. Favorite is the A-frame by far. The Hornadys I used in the 450 NE Factory loads were junk but are discontinued now. CEBs (Safari raptors) are junk because they break in 7 pieces if they touch a twig. You may get to pick your first shot, but if follow up shots involve shooting through brush you might as well throw snowballs. The rest are pretty good.