I phones Barnes and talked to Ty Herring, said a 3006 is more than energy at 550yrds on deer with a 165 grain bullet..
300 mag even more..It's up to the shooter..
It's has more than enough energy and it has the ballistic capability to go 800-900 yards if a person is willing even further..
But it's up to the shooter to make it work for him..
This has nothing to do with what people think is ethical or not.
It has to do with longest shot..
My cousin shot a small bull moose maybe 450-500lbs with a 300 Win
Mag at 735 yards and dropped him..
But I've seen that same 300 Win mag take 3 shots on a B&C mule deer and that deer still need a 4 at under 3 hundred yards..
You can never ever underestimate the stamina of an animal.,
And the fact is deer have way more stamina when hit by bullets than Moose do.. That's a fact., moose when hit, don't move..
Deer and elk do.,
Know your animals and go from there..