mikld, I've easily seen .020+ difference in my 357 brass, depending on how many times it's been reloaded and the power they were loaded at. I've been loading 357 and 38 Special since 1975 myself. I guess it all depends on how much stress you put on the cases as to how much they will grow. I will say that in my younger (and dumber) years, just about everything I loaded was pretty hot; when they get hard to extract back off .2 grains and call it good.