The guys I hunt with use the 30-06 in Northwestern Ontario. I do too from time to time, but this year my 303 will be the go to with the 7x57 being #2. Actually the moose still come in close to the call around here during the rut. Even slashes are only 300 yds or 400 yds and the 303 is up to the task if distances are known.
Patience is a benefit when calling or when stalking. The only places I have shot game over two hundred yds is in Africa. Here in NW Ontario it has been a long time since I have shot over 100, usually closer to 50.
Randy