A literal redditor already made quite a few pictures of the Kucher, so all I can give you is pic related.
https://imgur.com/gallery/ARne8
>There also were .38 super/9x23mm winchester/9x25mauser that are good performers with decent energy that does fall behind. .357mag but not by much
Let me pull your attention towards this:
https://en.wikipedia.org/wiki/9%C3%9725mm_Mauser#C96
>In 1940, Mauser officials proposed using the C-96 as the vehicle for an upgrade to the 9×25mm cartridge to match the ballistics of the .357 Magnum. The upgrade would entail increasing the velocity to 450 m/s and introducing a crimp around the mouth of the case.
Of course the source is a book that most likely doesn't have much more to say. And based on the date they most likely wanted to use the longer 140mm barrel, instead of the Bolo's 99mm.
So, how many Joules does .45 Super deliver?