I always considered Red Dot to fast for the 357. I like to use it for 38 Spl wadcutters.
I checked my 1973 Lyman Cast Bullet Handbook and they don't list loads for Red Dot in 357 - only 38 Spl.
My 1973 Hornady manual lists the following max loads:
125 JHP - 7.7gr. Red Dot - 1300fps
158 lead RN - 6.5 gr. Red Dot - 1200fps