Miss?
Well if you are gonna start being honest, I might as well hone up to the 6mm Remington having gotten a lot of play here, between the ears. Too, it's possible the 57mm case gets more favor here than others. Have a 6.5 barreled action that got first consideration, but its #2 contour is too big for the stock. And that one wouldn't have counted.
That case necked down to the 22 cal ought to produce some heat...maybe flame out of a 20". Had to look the Cheetah up and imagine it would too...:)
It's not about the 57mm case getting more play for play's sake. It's that a Mauser is a x57 rifle and they work the easiest with a x57 cartridge. Besides, why not use an intermediate length case in an intermediate length action.
