I tossed up the 20x45 (20P) and 20T or 20AI as some call it since its shoulder is blown out..
I have dies sets for both, but went w/the 20x45 (20P) for ease of brass in which I have 6k to use.
I also went w/the BBI 24" bbl from NSS, still waiting for it.
What is your twist going to be??