I've loaded thousands of .357's using Hornady's 158gr & 180gr XTP's using up to 12gr H110 and 9.5gr Blue Dot using both Winchester WSP and Winchester WSPM (magnum) primers and in all honesty, never noticed any difference i haven't chrono'd them, all I know is they went bang! And burned clean. From now on, I buy whatever's on sale, or cheaper