338 Win Mag... I think in a stainless Model 70, with a low power variable Leupold scope.
Not sure if you can get a stainless rifle with irons these days, but I'd get that if I could. That way if anything goes wrong with your scope (dropped and broken type thing) you could fall back on the irons. Moreover, I'd buy and carry a Williams FP for the rifle. If you had to re-zero anyways, why not have the benefit of the Williams?
And I think I'd want a laminated stock. (Just don't like most sythetics myself.)
That's an interesting round Levi... 358 Shooting Times Alaskan?
Does that have a Weatherby shoulder? (Don't mean to hijack...)
On topic, if I were taking an oddball calibre, I'd make sure to pack my ammo in 2 or 3 different pieces of luggage, or even ship some ahead just in case. You're sure not finding that stuff at the local sporting goods store!