Caliber Recommendation for 600 Yard Sheep Rifle

If you were getting a custom rifle built for the sole purpose of a stone sheep hunt (in grizz territory) and wanted to have 600 yard reach, what caliber would you go with?

I do handload/reload, but have heard some stores lately of ammunition/luggage getting lost, so part of me thinks it is wise to go with something a store in BC is going to carry

Thanks in advance
well your guide should be there for grizz trouble, and you will go to jail if you shoot a grizz there unless you are ripped up a bit
so 6.5 PRC 300win 300 PRC
 
270 Win or 7 mag both should be easy to find ammo for. Wouldn't worry about bears, if one is actually going to give you problems it's going to be within 50yrds and that's the guides job.
The guides do not carry any kind of weapon from what I was told. My wife will be with me as well, so I will not leave our fates to someone else.

In my only sheep hunt so far in the NWT (where all guides carried a 45-70) we had several grizzly encounters....there would be lots of times where the guide was 150+ yards away from me. When you are that far apart there is not much they can do even if they do have a weapon, not to mention they may not even hear you call out in the wind. Got to look out for yourself.
 
Thanks for the replies. I already have a 270, 300 win and a 7 mag, and all are contenders but all are also between 8-9#, so I am considering getting a NULA, Proof, etc...something lighter....and was wondering about a different caliber...
 
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