Mo, I had this very discussion on ammunition availability in 300 Win/Wea with a hunter that has traveled the world over yesterday. His African trophies literally would put a large museum to shame. Something OVER 160 Cape Buffalo, plus lion, leopard, musk ox, dall, desert, stone, marco polo, all the African plains, etc. He highly recommended the 300 Weatherby. He said they are available everywhere he has hunted and it will do everything the Winchester will do plus some.
That opinion carried a lot of weight with me. Not sure if my Hagn will be a Win or Wea but I am leaning toward the Wea much more now.
SS