Hi corey006,
Can't understand why the moose don't like it

. I never got the opportunity to pick up either a 600 or a 660 before the prices skyrocketed. So the first 673 I had my hands on....I bought. It's a .350 Remington Magnum and I sighted it in with the factory 200 grain Corelokts. I've had it out Whitetail hunting twice but have yet to pull the trigger.
Next spring when the wife and I move back to Alaska I intend to work up a good load with either a 225 or a 250 grain premium bullet. (Usually I start with Nosler's Partitions and see what results I get with them before I try any thing else.) I will do my best to see if I can make it disagreeable with a few moose...myself!
I might have to look at the 6.5 Remington Magnum.....huummm..pretty nice mountain rifle!?!