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Speaking of .357 AMP, here we have something that's only remembered by scant few boomers, the .357-44 Bobcat Magnum, much the same concept; neck down .44 Magnum to .357 caliber, so you can send such a projectile out at screaming velocities. In performance, these can be much compared to the .357 AMP, as well as the .357 Maximum (basically an extra long .357 Magnum).
There's an issue though, revolvers don't tend to like bottlenecked cartridges very much, with really no support on the bottom of the case, you tend to get the pressure pushing against the neck, deforming the case and stretching it backwards, where it can make it bind up the cylinder and prevent it from turning, and that's bothersome to undo. There's some approaches to this, the first is to just tell people to deal with it, and make sure they keep the chambers as clean as possible, which seems like it helps, the second is to find the exact angle and shape of the case neck where this stops happening, as .357/44 Bain & Davis (similar to the Bobcat) tried to do, and then there's pic related, gluing on a stepped polymer collar to the case neck, so that the neck has no room to expand.
Amazingly, this actually works.
