Dand is correct on this. Lil-Gun is not suited for lighter bullets. That is why there is no data listed for the 125gr. Lil-Gun will work fine with 158-180gr. bullets in the .357. I have used it in .44mag loads and it performs much better with 300 gr bullets than 240gr. If you want to shoot max velocity loads with the 125 gr. bulletin a .357, get some W296/H110.