Hey OP,

I liked the way you asked the two questions.
It showed me you already knew the answer.
You asked in terms of velocity, for a moderate loaded 19, using 158gr.

I handload more of the 158gr than any other. Nothing below 148gr.
I shoot my many 357 mags from 750fps up to about 1450fps.
Math tells me that 1100fps is in the middle or moderate. That's right where you suggested and my favorite.
That isn't a light load and it isn't a hot load. Leading should not occur and the recoil is there, but not punishing.

I love variety so I handload for the entire range available.

On that weak 19 issue, I don't think I will ever get to the 20,000 rounds of hot ammo that might make that real. My reading tells me that it's the extra POWDER that is required for light for caliber bullets that causes the erosion, not the bullet. Don't shoot light bullets and you can still keep them hot.

Prescut