When looking at reloading 300wm Data for Hodgdon H4350 powder with 150gn bullet it shows 69gns. of powder with the C.O.L. at 3.325 to 3.340, my Remington 700 300WM headspace measures 3.577 So I'm a little confused as to what length I should seat my bullets. I've only loaded handgun loads in the past, I'm finally working up some rifle loads and want to make sure I get it right.