I have never seen fully developed load data (with pressure) for a 357 Max in a rifle.
Depending on brass wall thickness and actual COL, the 350L has functionally the same ballistics as the 357 Max.
From the Hodgdon load center for a 24" 350L, their Lil'Gun was the fastest with data:
Lil'Gun, 180 gr, COL 2.110"
Start at 23.0 for 2,049 with 41,300 PSI
Max was 25.5 for 2,213 with 50,600 PSI
I have heard that Lil'gun gets spiky with hot loads so I would be reluctant to push this powder. On the other hand, I also seem to remember some pushing AA1680 and 300MP hard with acceptable results.
So, if you want maximum safe speed (probably not 2500 fps), you will probably want to seat the bullet as far out as possible, use thick cup rifle primers (such as CCI 450 or Rem 7 1/2) and work your way up very slowly. It is likely that you will need to exceed 51000 psi. Go too far and your primer pockets will start to expand (get looser). If you work up to a maximum load in cool temperatures, you should probably back off and work up to a maximum again when it gets hot. My guess is that your max speed without case damage will be closer to 2300 fps.
Last edited by P Flados; 12-09-2019 at 06:12 PM.