i'd recommend you use a lee collet die set, they for sure extend the life of your brass by a large margin, you don't have to lube your cases like you do for all FL dies other than RCBS carbide dies, and it allows your cases to be very tailored to your rifle by fireforming to contour to the exact dimensions of your particular chamber, which increases consistancy, accuracy, and speed of reloading... it's a win win win situation. I also believe that by neck sizing only you can develop loads much closer to max pressure without affecting the brass than you could by FL sizing alone.
Love the sig... how do you put something like that there? we should all take a lesson from you.