I used some of the cut down Max cases yesterday with 18.5 gr of Alliant 2400, 125 gr Golden Saber and a CCI 400. 2174 fps MV, 1312 ft lbs ME
The old 125 gr Sierra JHC load I used in my "new" M28-2 (1982 vintage DuPont SR 4756 in .357 Mag brass) clocked 2078 fps MV and 1199 ft lbs ME. With the new 2004 vintage IMR SR 4756, it clocked 2074 fps MV and 1194 ft lbs ME.
15.0 gr of Alliant 2400 in .357 Mag brass with a 170 gr 358429 and CCI 500 clocked 1706 fps MV and 1099 ft lbs ME.
All of these were shot with just a taper crimp in a standard .357 Mag chamber. A roll crimp may develope a little more velocity, but I think accuracy wouldn't be as good.
Maybe it'll quit raining so I can shoot 19.0 gr of 2400 in the cut down Max cases. That should get me over 2200 fps.
Maybe the longer brass with a healthy dose of SR 4756 will get me up to 2300 fps.