Ok, I recognize that many reloading books recommend or at least have tested a load, bullet, etc at a certain COL. However is there any harm done using a COL that is slightly longer than what a book may post as long at it's not longer than the max? I recognize that one should never go shorter that the recommended COL but is longer ever a problem? I've started doing .40 and I want to make sure I'm safe so I've been going closer to the max COL. On my 9mm same thing... however many books/references tend to vary the COL quite a bit. I find changing the COL for different powders on a 9mm to be tedious and it it necessary if I always err on the cautious side? I realize I might be forgoing some accuracy/speed but I'm ok with that.