"how do we know that clams are happy?" Clams are only happy twice a day..... always at high tide!!!!!
The old .35 Rem with 200 grain bullets will take almost anything that needs to be shot. I have taken numerous whitetail deer, a few Mulies, couple of Devil Dogs and ONE Elk. ALL dropped within 20 feet for where they were standing when the gun went off. Longest range was about 150 yards and the shortest was maybe 20 yards. Out to 150 yards I wouldn't hesitate to take a full size Elk.......