My two cents.............been reloading for my m14 for a few years now..........i use 150g sierra bullets, and 43 grains of Re-15..............and some of my cases are seven times fired now.............and still look just fine. Incidently, Re-15 is one of the few powders that works very well in the M14..........tried 4350,4064,N140........and no luck........but Re-15 works very well.