I'm a young re-loader and do not want to blow up my new .357mag. please help with info. My problem is un burnt powder in .38 reloads hornady 125gr. xtp jhp hodgdon universal clay powder @ 4.8 with small primers. Using mag. primers in .38 case with .38 powder charge and 38 bullet 125gr.?:feedback: I have re-loaded @ 175 round in my first month.