What's the scoop on the brass from Laz exactly? They don't have "any" in supply, or they don't have any "quality" brass in supply?
I'm building a 30/338 Lapua 40deg Imp. I'd think you could clean up the Warbird chamber with the Lapua Imp but... would it be worth it? Up to you really. The brass is of the highest quality, not sure about the Warbird brass cost but the Lapua is $130 a hundred, capacity will be about 120gr water... 3-7gr more than the 300 Ultra. Tougher brass than the Ultras. My dies are being made by Jim Carstensen. $90 for the inline seater, $125 for the bushing FL die or a NK die either one. It might be a little more for a 7/8" threaded seater though, he said it takes longer because he makes a sleeve for them like the Redding Competition seaters have.
Reamer was $135 from Dave Kiff at Pacific Tool & Gauge.
What action are you using?
A few more things to consider...