As Mentioned brass is scarce but if the deal was good enough I would take my chances. After playing a little with the 28 Nosler I am impressed with the big 7mm's. The 7STW is in that league.
"Anyone taking up handloading necessarily plays with unknown factors and takes chances. But so does anyone who drives a car,goes to a cocktail party,eats in a restaurant,or gets married."
Jack O'Connor 1963