I shoot Barnes 165 ttsx out of my Kimber Montana but lately they have been hard to find.
If you have a Turners near you they have a big ammo sale going on and also I used to find the Barnes at Sportsman warehouse.
Reloading always keeps ammo on the shelf. I have a 300WSM loaded with 160g Hammer Hunters and I probably won't even use it this year. Too bad you aren't closer or I'd be glad to load you up some.
Best of luck finding what you need.