Got a nice doe yesterday evening with the wby. Clean entry, clean exit right behind the shoulder. She ran off about 30yds before coming to her final resting place. The exit was about 2 1/2 in. in diameter and there some significant bruising around the front of the rib cage. The round did not make turn her insides into "soup" as some have said.
Bottom line: While it may be overkill, the .300 wby mag makes for an extremely efficient kill without doing catastrophic damage and ruining the spoils of the kill.
Thanks for all the input! I'm extremely happy with my purchase.