So, I have been reloading for a while and have been giving it some thought lately....all the reloading data for .45 Colt that I have seen says max COL is 1.60". So, why when, is there a ring set close to where the cartridge mouth ends on the bullet itself? It seems this is intended for bullet depth and crimping, but in doing so, the COL will be longer than the 1.60" max....What is this ring for, if not that? Does anyone crimp in this groove? Would it hurt anything to have a slightly longer COL?