I am loading for a .243 and the "trim to length" listed in the loading manual is 2.035. Does this mean that if I want accurate ammo I need to make sure all brass measures exactly 2.035 before I load it? After I resize my brass it has often grown to 2.038-2.044. Do I always have to trim this back to 2.035 or is there an acceptable range where it doesn't need to be trimmed? Also, what about going the other direction? I have a batch of once fired Federal brass that all measure 2.032. Will this case length produce different results than a case that measures 2.035? Or will they both work pretty much the same? I guess my questions is...at what point do I need to trim the brass and how far should back should I trim it? Right now I am loading for .243 and .308. I am using fire formed brass and neck sizing only with Lee Collet dies, although I do have RCBS full length sizing dies as well.