.243 for deer, I have shot one moose with my .308(biggest I owned then)
If I was looking for moose/elk now, I'd be carrying my .300 wm.
Went on a guided hunt in Newfoundland, everyone was carrying somethingorother magnum. When we were leaving the guides were going out to get their own moose and most were carrying .30-30s. The biggest gun the guides had was .270. These were older guys who had shot moose all their lives. Maybe they did'nt have cable so they don't know a .30-30 won't kill a deer, let alone a moose.