If and when you receive the dies, measure a case sized in them to a fired case. I did this with my .375/06IMP and the dies they sent to my buddy. Their dies followed the Ackley chamber, not the 3 fired cases I had sent them which mirrored out chambers. I re-sent the dies to them with more fired brass, twice, both times receiving the dies back, unaltered. They would not make the dies to the cases sent to them. Not very good marketing, imho.
I use standard Hornady Styer dies and just neck size. Gotta love their seating die. Will do ALL .375 ctgs. including the WTBY's.
I use a .17AckBee Hornady seater die for 3 different cases, including the .17 Rem.
That is a well earned plug for Hornady dies. I really like their extremely tapered expander plugs in the sizing dies as well.