I did the first Airgun hunts in South Africa for big game 10 years ago, which were done under permission of the Minstry of Tourism with oversight by the East Cape Game Management Association. I've also taken more big game with an airgun than anybody else (including Afircan game), dozens of warthog, springbuck, Impala, bleesbuck, bushbuck, duiker, steenbok, other antelope and a few kudu. A 200 fpe .357 can do the job, but it's the wrong gun and I consider it more of a promotional exercise than a demonstration of an optimal gun for this game.
The first guns I took over were Quackenbush's in .50, .457, and .308. On seven hunts since that time, I've also used the Dragonslayer .50, BigBore 909 .45 which are lower power and used only for the small antelope. Have also taken the Extreme in .457 and a few other models on my hunts. My opinion is that an adequate gun for the African antelope should be at least a .40 or over and generate 400 fpe. You can easily kill a whitetail or a black bear with a .22 rimfire, but there is a reason it's illegal almost everywhere. I think when companies use the wrong gun for the wrong game, it gets attention but is not good for the sport in the long run.
I am not the Airgun police and don't want to come across that way, and have made my share of wrong decisions. When we started with big bore Airguns nobody knew what they could do, so we were pushing boundries..... that is no longer the case and there is no longer the need. What Crosman is promoting is not unethical, shooting a hog with a sub 20 fpe springer is unethical, a 200 fpe .357 simply is not the best tool for the job. I have every big bore on the market and some that are not, and I know which I'd use on my hunts.
Jim