[Jeff Chandler]

So the real question is how does the (modern)10mm compare to the .357 magnum?

Better make that apples to apples:

How does the 10mm compare to the .357 SIG?

[JudgemAll]

10mm has bigger bullet for stopping hunting power, has lower pressure hence better handling and it also has more power, than the 357 SIG.

Between the two I would go 10mm if your hands are big enough.

I believe the 10mm when shortened became the .40, and when the .40 became necked down, it became the .357 SIg. The 10mm is the “father-mother” of these cartdriges (father bullet, casing mother)