I am an advocate of at least trying a crimp but there area few things to mind. Cases must be the same LOT and length or you are peeing into a gale. Not just any crimp, either. "Built in" crimps will give less than quality results. Some independent taper-crimp dies are good. The Lee Factory Crimp die is the best method I've found and the only one I use for centerfire rifle. You need to play with it a bit, varying crimping pressures. I have a set of fine, wire feeler gauges that I use between the fingers of the collet when I feel the need. Mostly I just lock the die and leave it when I have found my load. Additionally, once you get a FCD, don't be afraid to revisit earlier loads that didn't quite make the muster. It often changes the characteristics of the burning rate and makes a mediocre load acceptable. Remember; it is a variable that can be adjusted. Work it.~Muir