My father has a winchester rifle chambered in 338wm. I have been helping him reload for it so he can hunt moose with it. Hes using 225 nosler partitions with federal large magnum primers. We've managed to get his his rifle shoot an ES of 3 and SD of 1.7.... With a powder charge of 72.5 of RL19, however his groups are like 5" at 100. Do I assume my next step is adjusting his seating depth?