Thanks Rule 303. The reason for the Whelen case over the 06 is that when you neck down the Whelen in a 8x64S full length sizing die it will create a false shoulder that will provide the correct headspace for fire forming. No need to trim as the 64S case is a little bit longer. I prefer this method to seating the bullets way out and getting a crush fit.I have 50 cases that should last me a while.