In my limited reloading experience, Don't bother with amerc cases. The primer holes are mostly off center & processing over a thousand cases in a day will put blisters on your hand
. My favorite plinker load is 4.5gr w231 for 115gr fmj. Its mild,clean & functions in all my 9mms. I also segregate all my 9mm brass by headstamps for consistancy. Lee factory crimp dies works great.