What did you figure out?
I use alpha in 6.5x47, 6creed and 6dasher
And Peterson brass in 300WM, 338lapua, 6creed and 6br.
Lapua brass in 6.5 Prc and 6br brass in a short barrel 6 dasher.
It is all great brass and I use all three without hesitation, but I feel Alpha is the best.