Mikes doing a 300 WSM throated for the 215 bergers for me too! Wish I had realized the 300 WSM doesn't have the best brass options though.
Looks good!
Short of the sorting the Winchester brass isn't bad. I shoot 215's 2960 with R-26 in my long throated 300wsm with 26" barrel. I'm on my 6th firing and the primer pockets are still good.