same here rog, we use wlr's only.
some jus won't "come outta tha closet" when adverse'n bout tha whelen....
to much speculation and notta nuff hands-on for the real truth.
it takes more thana photogenic memory of what one reads ora repeat of what sumone
said. we have broke it down to plc i/o mics and infared scans of different chamber dimensions
with cad013 software
with shoulder, body, neck and rim cuts(if any) of many manufactures design.
all with different tolerances and much more spread with higher end rifles.
its all in how tha truer has pride in his product.
we use the same approach used to determine armament technology.