Buckeye, the difference in the 357 Mag data as published currently by Western is they now list the Win SPM primer with all 357 loads. That particular primer is the hottest small pistol primer on the market. Since I was using standard CCI 500 primers, I felt confident in easing up slightly higher with my powder charge. I did not experience any issues at this level with these particular components, but please work up carefully yourself.
Mark in GA