Re: 300gr. wildcat or smk
I don't know if they will stabilize or not. I have no experience above the 252gr in a Win Mag.
But I will say this, the 252s that I had were one good bullet. Shot better than any other I tried. They had kind of hunting type point with reduced the BC a bit but I don't know if that is standard on all WC 338s.
My expansion tests were also very good with the WCs.
If the construction of the 300s is the same as the 252s they should be a great hunting bullet in that big boomer.
The SMKs are more available.
Just my thoughts......
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!